APPEAL FROM THE UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT OF INDIANA.
White, J., announced the judgment of the Court and delivered the opinion of the Court with respect to Part II, in which Brennan, Marshall, Blackmun, Powell, and Stevens, JJ., joined, and an opinion with respect to Parts I, III, and IV, in which Brennan, Marshall, and Blackmun, JJ., joined. Burger, C. J., filed an opinion concurring in the judgment, post, p. 143. O'connor, J., filed an opinion concurring in the judgment, in which Burger, C. J., and Rehnquist, J., joined, post, p. 144. Powell, J., filed an opinion concurring in part and dissenting in part, in which Stevens, J., joined, post, p. 161.
JUSTICE WHITE announced the judgment of the Court and delivered the opinion of the Court as to Part II and an opinion as to Parts I, III, and IV, in which JUSTICE BRENNAN, JUSTICE MARSHALL, and JUSTICE BLACKMUN join.
In this case, we review a judgment from a three-judge District Court, which sustained an equal protection challenge to Indiana's 1981 state apportionment on the basis that the law unconstitutionally diluted the votes of Indiana Democrats. 603 F.Supp. 1479 (SD Ind. 1984). Although we find such political gerrymandering to be justiciable, we conclude that the District Court applied an insufficiently demanding standard in finding unconstitutional vote dilution. Consequently, we reverse.
The Indiana Legislature, also known as the "General Assembly," consists of a House of Representatives and a Senate. There are 100 members of the House of Representatives, and 50 members of the Senate. The members of the House serve 2-year terms, with elections held for all seats every two years. The members of the Senate serve 4-year terms, and Senate elections are staggered so that half of the seats are up for election every two years. The members of both Houses are elected from legislative districts; but, while all Senate members are elected from single-member districts, House members are elected from a mixture of single-member and multimember districts. The division of the State into districts is accomplished by legislative enactment, which is signed by the Governor into law. Reapportionment is required every 10 years and is based on the federal decennial census. There is no prohibition against more frequent reapportionments.
In early 1981, the General Assembly initiated the process of reapportioning the State's legislative districts pursuant to the 1980 census. At this time, there were Republican majorities in both the House and the Senate, and the Governor
was Republican.*fn1 Bills were introduced in both Houses, and a reapportionment plan was duly passed and approved by the Governor.*fn2 This plan provided 50 single-member districts for the Senate; for the House, it provided 7 triple-member, 9 double-member, and 61 single-member districts. In the Senate plan, the population deviation between districts was 1.15%; in the House plan, the deviation was 1.05%. The multimember districts generally included the more metropolitan areas of the State, although not every metropolitan area was in a multimember district. Marion County, which includes Indianapolis, was combined with portions of its neighboring counties to form five triple-member districts. Fort Wayne was divided into two parts, and each part was combined with portions of the surrounding county or counties to make two triple-member districts. On the other hand, South Bend was divided and put partly into a double-member district and partly into a single-member district (each part
combined with part of the surrounding county or counties). Although county and city lines were not consistently followed, township lines generally were. The two plans, the Senate and the House, were not nested; that is, each Senate district was not divided exactly into two House districts. There appears to have been little relation between the lines drawn in the two plans.
In early 1982, this suit was filed by several Indiana Democrats (here the appellees) against various state officials (here the appellants), alleging that the 1981 reapportionment plans constituted a political gerrymander intended to disadvantage Democrats. Specifically, they contended that the particular district lines that were drawn and the mix of single-member and multimember districts were intended to and did violate their right, as Democrats, to equal protection under the Fourteenth Amendment. A three-judge District Court was convened to hear these claims.
In November 1982, before the case went to trial, elections were held under the new districting plan. All of the House seats and half of the Senate seats were up for election. Over all the House races statewide, Democratic candidates received 51.9% of the vote. Only 43 Democrats, however, were elected to the House. Over all the Senate races statewide, Democratic candidates received 53.1% of the vote. Thirteen (of twenty-five) Democrats were elected. In Marion and Allen Counties, both divided into multimember House districts, Democratic candidates drew 46.6% of the vote, but only 3 of the 21 House seats were filled by Democrats.
On December 13, 1984, a divided District Court issued a decision declaring the reapportionment to be unconstitutional, enjoining the appellants from holding elections pursuant to the 1981 redistricting, ordering the General Assembly to prepare a new plan, and retaining jurisdiction over the case. See 603 F.Supp. 1479.
To the District Court majority, the results of the 1982 elections seemed "to support an argument that there is a built-in bias favoring the majority party, the Republicans, which instituted the reapportionment plan." Id., at 1486. Although the court thought that these figures were unreliable predictors of future elections, it concluded that they warranted further examination of the circumstances surrounding the passage of the reapportionment statute. See ibid.*fn3 In the course of this further examination, the court noted the irregular shape of some district lines, the peculiar mix of single-member and multimember districts,*fn4 and the failure of the district lines to adhere consistently to political subdivision boundaries to define communities of interest. The court also found inadequate the other explanations given for the configuration of the districts, such as adherence to the one person, one vote imperative and the Voting Rights Act's no retrogression requirement. These factors, concluded the court, evidenced an intentional effort to favor Republican incumbents and candidates and to disadvantage Democratic voters.*fn5 This was achieved by "stacking" Democrats into
districts with large Democratic majorities and "splitting" them in other districts so as to give Republicans safe but not excessive majorities in those districts.*fn6 Because the 1982 elections indicated that the plan also had a discriminatory effect in that the proportionate voting influence of Democratic voters had been adversely affected and because any scheme "which purposely [inhibits] or [prevents] proportional representation cannot be tolerated," id., at 1492, the District Court invalidated the statute.*fn7
The defendants appealed, seeking review of the District Court's rulings that the case was justiciable and that, if justiciable, an equal protection violation had occurred.*fn8 We noted probable jurisdiction. 470 U.S. 1083 (1985).
We address first the question whether this case presents a justiciable controversy or a non-justiciable political question. Although the District Court never explicitly stated that the case was justiciable, its holding clearly rests on such a finding. The appellees urge that this Court has in the past acknowledged and acted upon the justiciability of purely political gerrymandering claims. The appellants contend that we have affirmed on the merits decisions of lower courts finding such claims to be non-justiciable.
Since Baker v. Carr, 369 U.S. 186 (1962), we have consistently adjudicated equal protection claims in the legislative districting context regarding inequalities in population between districts. In the course of these cases, we have developed and enforced the "one person, one vote" principle. See, e. g., Reynolds v. Sims, 377 U.S. 533 (1964).
Our past decisions also make clear that even where there is no population deviation among the districts, racial gerrymandering presents a justiciable equal protection claim. In the multimember district context, we have reviewed, and on occasion rejected, districting plans that unconstitutionally diminished the effectiveness of the votes of racial minorities. See Rogers v. Lodge, 458 U.S. 613 (1982); Mobile v. Bolden, 446 U.S. 55 (1980); White v. Regester, 412 U.S. 755 (1973); Whitcomb v. Chavis, 403 U.S. 124 (1971); Burns v. Richardson, 384 U.S. 73 (1966); Fortson v. Dorsey, 379 U.S. 433 (1965). We have also adjudicated claims that the configuration of single-member districts violated equal protection with respect to racial and ethnic minorities, although we have never struck down an apportionment plan because of such a claim. See United Jewish Organizations of Williamsburgh, Inc. v. Carey, 430 U.S. 144 (1977); Wright v. Rockefeller, 376 U.S. 52 (1964).
In the multimember district cases, we have also repeatedly stated that districting that would "operate to minimize or cancel out the voting strength of racial or political elements of the voting population" would raise a constitutional question. Fortson, supra, at 439 (emphasis added). See also Gaffney v. Cummings, 412 U.S. 735, 751 (1973); Whitcomb v. Chavis, supra, at 143; Burns v. Richardson, supra, at 88. Finally, in Gaffney v. Cummings, supra, we upheld against an equal protection political gerrymandering challenge a state legislative single-member redistricting scheme that was formulated in a bipartisan effort to try to provide political representation on a level approximately proportional to the strength of political parties in the State. In that case, we adjudicated the type of purely political equal protection claim that is brought here, although we did not, as a threshold matter, expressly hold such a claim to be justiciable. Regardless of this lack of a specific holding, our consideration of the merits of the claim in Gaffney in the face of a discussion of justiciability in appellant's brief, combined
with our repeated reference in other opinions to the constitutional deficiencies of plans that dilute the vote of political groups, at the least supports an inference that these cases are justiciable.
In the years since Baker v. Carr, both before and after Gaffney, however, we have also affirmed a number of decisions in which the lower courts rejected the justiciability of purely political gerrymandering claims. In WMCA, Inc. v. Lomenzo, 382 U.S. 4 (1965), summarily aff'g 238 F.Supp. 916 (SDNY), the most frequently cited of these cases, we affirmed the decision of a three-judge District Court upholding a temporary apportionment plan for the State of New York. The District Court had determined that political gerrymandering equal protection challenges to this plan were non-justiciable. See id., at 925-926. Justice Harlan, in his opinion concurring in the Court's summary affirmance, expressed his understanding that the affirmance was based on the Court's approval of the lower court's finding of nonjusticiability. See 382 U.S., at 6. See also Jimenez v. Hidalgo County Water Improvement District No. 2, 424 U.S. 950 (1976), summarily aff'g 68 F.R.D. 668 (SD Tex. 1975); Ferrell v. Hall, 406 U.S. 939 (1972), summarily aff'g 339 F.Supp. 73 (WD Okla.); Wells v. Rockefeller, 398 U.S. 901 (1970), summarily aff'g 311 F.Supp. 48 (SDNY). Although these summary affirmances arguably support an inference that these claims are not justiciable, there are other cases in which federal or state courts adjudicated political gerrymandering claims and we summarily affirmed or dismissed for want of a substantial federal question. See, e. g., Wiser v. Hughes, 459 U.S. 962 (1982), dismissing for want of a substantial federal question an appeal from In re Legislative Districting, 299 Md. 658, 475 A. 2d 428; Kelly v. Bumpers, 413 U.S. 901 (1973), summarily aff'g 340 F.Supp. 568 (ED Ark. 1972); Archer v. Smith, 409 U.S. 808 (1972), summarily aff'g Graves v. Barnes, 343 F.Supp. 704, 734 (WD Tex.).
These sets of cases may look in different directions, but to the extent that our summary affirmances indicate the nonjusticiability of political gerrymander cases, we are not bound by those decisions. As we have observed before, "[it] is not at all unusual for the Court to find it appropriate to give full consideration to a question that has been the subject of previous summary action." Washington v. Yakima Indian Nation, 439 U.S. 463, 477, n. 20 (1979). See also Edelman v. Jordan, 415 U.S. 651, 670-671 (1974). The issue that the appellants would have us find to be precluded by these summary dispositions is an important one, and it deserves further consideration.
The outlines of the political question doctrine were described and to a large extent defined in Baker v. Carr. The synthesis of that effort is found in the following passage in the Court's opinion:
"It is apparent that several formulations which vary slightly according to the settings in which the questions arise may describe a political question, although each has one or more elements which identify it as essentially a function of the separation of powers. Prominent on the surface of any case held to involve a political question is found a textually demonstrable constitutional commitment of the issue to a coordinate political department; or a lack of judicially discoverable and manageable standards for resolving it; or the impossibility of deciding without an initial policy determination of a kind clearly for non-judicial discretion; or the impossibility of a court's undertaking independent resolution without expressing lack of the respect due coordinate branches of government; or an unusual need for unquestioning adherence to a political decision already made; or the potentiality of embarrassment from multifarious pronouncements by various departments on one question.
"Unless one of these formulations is inextricable from the case at bar, there should be no dismissal for nonjusticiability on the ground of a political question's presence. The doctrine of which we treat is one of 'political questions,' not one of 'political cases.' The courts cannot reject as 'no law suit' a bona fide controversy as to whether some action denominated 'political' exceeds constitutional authority. The cases we have reviewed show the necessity for discriminating inquiry into the precise facts and posture of the particular case, and the impossibility of resolution by any semantic cataloguing." 369 U.S., at 217.
In Baker, the Court applied this analysis to an equal protection claim based on a state legislative apportionment that allowed substantial disparities in the number of voters represented by each state representative. See id., at 253-258 (Clark, J., concurring). In holding that claim to be justiciable, the Court concluded that none of the identifying characteristics of a political question were present:
"The question here is the consistency of state action with the Federal Constitution. We have no question decided, or to be decided, by a political branch of government coequal with this Court. Nor do we risk embarrassment of our government abroad, or grave disturbance at home if we take issue with Tennessee as to the constitutionality of her action here challenged. Nor need the appellants, in order to succeed in this action, ask the Court to enter upon policy determinations for which judicially manageable standards are lacking. Judicial standards under the Equal Protection Clause are well developed and familiar, and it has been open to courts since the enactment of the Fourteenth Amendment to determine, if on the particular facts they must, that a discrimination reflects no policy, but simply arbitrary and capricious action." Id., at 226.
This analysis applies equally to the question now before us. Disposition of this question does not involve us in a matter more properly decided by a coequal branch of our Government. There is no risk of foreign or domestic disturbance, and in light of our cases since Baker we are not persuaded that there are no judicially discernible and manageable standards by which political gerrymander cases are to be decided.
It is true that the type of claim that was presented in Baker v. Carr was subsequently resolved in this Court by the formulation of the "one person, one vote" rule. See, e. g., Reynolds v. Sims, 377 U.S., at 557-561. The mere fact, however, that we may not now similarly perceive a likely arithmetic presumption in the instant context does not compel a conclusion that the claims presented here are non-justiciable. The one person, one vote principle had not yet been developed when Baker was decided. At that time, the Court did not rely on the potential for such a rule in finding justiciability. Instead, as the language quoted above clearly indicates, the Court contemplated simply that legislative line drawing in the districting context would be susceptible of adjudication under the applicable constitutional criteria.
Furthermore, in formulating the one person, one vote formula, the Court characterized the question posed by election districts of disparate size as an issue of fair representation. In such cases, it is not that anyone is deprived of a vote or that any person's vote is not counted. Rather, it is that one electoral district elects a single representative and another district of the same size elects two or more -- the elector's vote in the former district having less weight in the sense that he may vote for and his district be represented by only one legislator, while his neighbor in the adjoining district votes for and is represented by two or more. Reynolds accordingly observed:
"Since the achieving of fair and effective representation for all citizens is concededly the basic aim of legislative
apportionment, we conclude that the Equal Protection Clause guarantees the opportunity for equal participation by all voters in the election of State legislators. Diluting the weight of votes because of place of residence impairs basic constitutional rights under the Fourteenth Amendment just as much as invidious discriminations based upon factors such as race . . . ." 377 U.S., at 565-566.
Reynolds surely indicates the justiciability of claims going to the adequacy of representation in state legislatures.
The issue here is of course different from that adjudicated in Reynolds. It does not concern districts of unequal size. Not only does everyone have the right to vote and to have his vote counted, but each elector may vote for and be represented by the same number of lawmakers. Rather, the claim is that each political group in a State should have the same chance to elect representatives of its choice as any other political group. Nevertheless, the issue is one of representation, and we decline to hold that such claims are never justiciable.
Our racial gerrymander cases such as White v. Regester and Whitcomb v. Chavis indicate as much. In those cases, there was no population variation among the districts, and no one was precluded from voting. The claim instead was that an identifiable racial or ethnic group had an insufficient chance to elect a representative of its choice and that district lines should be redrawn to remedy this alleged defect. In both cases, we adjudicated the merits of such claims, rejecting the claim in Whitcomb and sustaining it in Regester. Just as clearly, in Gaffney v. Cummings, where the districts also passed muster under the Reynolds formula, the claim was that the legislature had manipulated district lines to afford political groups in various districts an enhanced opportunity to elect legislators of their choice. Although advising caution, we said that "we must. . . respond to [the] claims . . . that even if acceptable populationwise, the . . . plan was
invidiously discriminatory because a 'political fairness principle' was followed . . . ." 412 U.S., at 751-752 (emphasis added). We went on to hold that the statute at issue did not violate the Equal Protection Clause.
These decisions support a conclusion that this case is justiciable. As Gaffney demonstrates, that the claim is submitted by a political group, rather than a racial group, does not distinguish it in terms of justiciability. That the characteristics of the complaining group are not immutable or that the group has not been subject to the same historical stigma may be relevant to the manner in which the case is adjudicated, but these differences do not justify a refusal to entertain such a case.
In fact, JUSTICE O'CONNOR's attempt to distinguish this political gerrymandering claim from the racial gerrymandering claims that we have consistently adjudicated demonstrates the futility of such an effort. Her conclusion that the claim in this case is not justiciable seems to rest on a dual concern that no judicially manageable standards exist and that adjudication of such claims requires an initial policy decision that the judiciary should not make. Yet she does not point out how the standards that we set forth here for adjudicating this political gerrymandering claim are less manageable than the standards that have been developed for racial gerrymandering claims. Nor does she demonstrate what initial policy decision -- regarding, for example, the desirability of fair group representation -- we have made here that we have not made in the race cases.*fn9 She merely asserts that because
race has historically been a suspect classification individual minority voters' rights are more immediately related to a racial minority group's voting strength. This, in combination with "the greater warrant the Equal Protection Clause gives the federal courts to intervene for protection against racial discrimination, suffice to render racial gerrymandering claims justiciable." Post, at 151 (O'CONNOR, J., concurring in judgment).
Reliance on these assertions to determine justiciability would transform the narrow categories of "political questions" that Baker v. Carr carefully defined into an ad hoc litmus test of this Court's reactions to the desirability of and need for judicial application of constitutional or statutory standards to a given type of claim. JUSTICE O'CONNOR's own discussion seems to reflect such an approach: She concludes that because political gerrymandering may be a "self-limiting enterprise" there is no need for judicial intervention. Post, at 152. She also expresses concern that our decision today will lead to "political instability and judicial malaise," post, at 147, because nothing will prevent members of other identifiable groups from bringing similar claims. To begin with, JUSTICE O'CONNOR's factual assumptions are by no means obviously correct: It is not clear that political gerrymandering is a self-limiting enterprise or that other groups will have any great incentive to bring gerrymandering claims, given the requirement of a showing of discriminatory intent. At a more fundamental level, however, JUSTICE O'CONNOR's analysis is flawed because it focuses on the perceived need for judicial review and on the potential practical problems with allowing such review. Validation of the consideration
of such amorphous and wide-ranging factors in assessing justiciability would alter substantially the analysis the Court enunciated in Baker v. Carr, and we decline JUSTICE O'CONNOR's implicit invitation to rethink that approach.
Having determined that the political gerrymandering claim in this case is justiciable, we turn to the question whether the District Court erred in holding that the appellees had alleged and proved a violation of the Equal Protection Clause.
Preliminarily, we agree with the District Court that the claim made by the appellees in this case is a claim that the 1981 apportionment discriminates against Democrats on a statewide basis. Both the appellees and the District Court have cited instances of individual districting within the State which they believe exemplify this discrimination, but the appellees' claim, as we understand it, is that Democratic voters over the State as a whole, not Democratic voters in particular districts, have been subjected to unconstitutional discrimination. See, e. g., Complaint of Bandemer Plaintiffs 3-7. Although the statewide discrimination asserted here was allegedly accomplished through the manipulation of individual district lines, the focus of the equal protection inquiry is necessarily somewhat different from that involved in the review of individual districts.
We also agree with the District Court that in order to succeed the Bandemer plaintiffs were required to prove both intentional discrimination against an identifiable political group and an actual discriminatory effect on that group. See, e. g., Mobile v. Bolden, 446 U.S., at 67-68. Further, we are confident that if the law challenged here had discriminatory effects on Democrats, this record would support a finding that the discrimination was intentional. Thus, we decline to overturn the District Court's finding of discriminatory intent as clearly erroneous.
Indeed, quite aside from the anecdotal evidence, the shape of the House and Senate Districts, and the alleged disregard for political boundaries, we think it most likely that whenever a legislature redistricts, those responsible for the legislation will know the likely political composition of the new districts and will have a prediction as to whether a particular district is a safe one for a Democratic or Republican candidate or is a competitive district that either candidate might win. As we said in Gaffney v. Cummings, 412 U.S., at 752-753:
"It would be idle, we think, to contend that any political consideration taken into account in fashioning a reapportionment plan is sufficient to invalidate it. Our cases indicate quite the contrary. See White v. Regester, [412 U.S. 755 (1973)]; Burns v. Richardson, [384 U.S. 73 (1966)]; Whitcomb v. Chavis, [403 U.S. 124 (1971)]; Abate v. Mundt, [403 U.S. 182 (1971)]. The very essence of districting is to produce a different -- a more 'politically fair' -- result than would be reached with elections at large, in which the winning party would take 100% of the legislative seats. Politics and political considerations are inseparable from districting and apportionment. The political profile of a State, its party registration, and voting records are available precinct by precinct, ward by ward. These subdivisions may not be identical with census tracts, but, when overlaid on a census map, it requires no special genius to recognize the political consequences of drawing a district line along one street rather than another. It is not only obvious, but absolutely unavoidable, that the location and shape of districts may well determine the political complexion of the area. District lines are rarely neutral phenomena. They can well determine what district will be predominantly Democratic or predominantly Republican, or make a close race likely. Redistricting may pit incumbents against one another or make very difficult the election
of the most experienced legislator. The reality is that districting inevitably has and is intended to have substantial political consequences.
"It may be suggested that those who redistrict and reapportion should work with census, not political, data and achieve population equality without regard for political impact. But this politically mindless approach may produce, whether intended or not, the most grossly gerrymandered results; and, in any event, it is most unlikely that the political impact of such a plan would remain undiscovered by the time it was proposed or adopted, in which event the results would be both known and, if not changed, intended."*fn10
As long as redistricting is done by a legislature, it should not be very difficult to prove that the likely political consequences of the reapportionment were intended.*fn11
We do not accept, however, the District Court's legal and factual bases for concluding that the 1981 Act visited a sufficiently adverse effect on the appellees' constitutionally protected rights to make out a violation of the Equal Protection Clause. The District Court held that because any apportionment
scheme that purposely prevents proportional representation is unconstitutional, Democratic voters need only show that their proportionate voting influence has been adversely affected. 603 F.Supp., at 1492. Our cases, however, clearly foreclose any claim that the Constitution requires proportional representation or that legislatures in reapportioning must draw district lines to come as near as possible to allocating seats to the contending parties in proportion to what their anticipated statewide vote will be. Whitcomb v. Chavis, 403 U.S., at 153, 156, 160; White v. Regester, 412 U.S., at 765-766.
The typical election for legislative seats in the United States is conducted in described geographical districts, with the candidate receiving the most votes in each district winning the seat allocated to that district. If all or most of the districts are competitive -- defined by the District Court in this case as districts in which the anticipated split in the party vote is within the range of 45% to 55% -- even a narrow statewide preference for either party would produce an overwhelming majority for the winning party in the state legislature. This consequence, however, is inherent in winner-take-all, district-based elections, and we cannot hold that such a reapportionment law would violate the Equal Protection Clause because the voters in the losing party do not have representation in the legislature in proportion to the statewide vote received by their party candidates. As we have said: "[We] are unprepared to hold that district-based elections decided by plurality vote are unconstitutional in either single- or multi-member districts simply because the supporters of losing candidates have no legislative seats assigned to them." Whitcomb v. Chavis, supra, at 160. This is true of a racial as well as a political group. White v. Regester, supra, at 765-766. It is also true of a statewide claim as well as an individual district claim.
To draw district lines to maximize the representation of each major party would require creating as many safe seats
for each party as the demographic and predicted political characteristics of the State would permit. This in turn would leave the minority in each safe district without a representative of its choice. We upheld this "political fairness" approach in Gaffney v. Cummings, despite its tendency to deny safe district minorities any realistic chance to elect their own representatives. But Gaffney in no way suggested that the Constitution requires the approach that Connecticut had adopted in that case.
In cases involving individual multimember districts, we have required a substantially greater showing of adverse effects than a mere lack of proportional representation to support a finding of unconstitutional vote dilution. Only where there is evidence that excluded groups have "less opportunity to participate in the political processes and to elect candidates of their choice" have we refused to approve the use of multimember districts. Rogers v. Lodge, 458 U.S., at 624. See also United Jewish Organizations of Williamsburgh, Inc. v. Carey, 430 U.S., at 167; White v. Regester, supra, at 765-766; Whitcomb v. Chavis, supra, at 150. In these cases, we have also noted the lack of responsiveness by those elected to the concerns of the relevant groups. See Rogers v. Lodge, supra, at 625-627; White v. Regester, supra, at 766-767.*fn12
These holdings rest on a conviction that the mere fact that a particular apportionment scheme makes it more difficult for a particular group in a particular district to elect the representatives of its choice does not render that scheme constitutionally infirm. This conviction, in turn, stems from a perception
that the power to influence the political process is not limited to winning elections. An individual or a group of individuals who votes for a losing candidate is usually deemed to be adequately represented by the winning candidate and to have as much opportunity to influence that candidate as other voters in the district. We cannot presume in such a situation, without actual proof to the contrary, that the candidate elected will entirely ignore the interests of those voters. This is true even in a safe district where the losing group loses election after election. Thus, a group's electoral power is not unconstitutionally diminished by the simple fact of an apportionment scheme that makes winning elections more difficult, and a failure of proportional representation alone does not constitute impermissible discrimination under the Equal Protection Clause. See Mobile v. Bolden, 446 U.S., at 111, n. 7 (MARSHALL, J., dissenting).
As with individual districts, where unconstitutional vote dilution is alleged in the form of statewide political gerrymandering, the mere lack of proportional representation will not be sufficient to prove unconstitutional discrimination. Again, without specific supporting evidence, a court cannot presume in such a case that those who are elected will disregard the disproportionately underrepresented group. Rather, unconstitutional discrimination occurs only when the electoral system is arranged in a manner that will consistently degrade a voter's or a group of voters' influence on the political process as a whole.
Although this is a somewhat different formulation than we have previously used in describing unconstitutional vote dilution in an individual district, the focus of both of these inquiries is essentially the same.*fn13 In both contexts, the question is whether a particular group has been unconstitutionally denied
its chance to effectively influence the political process. In a challenge to an individual district, this inquiry focuses on the opportunity of members of the group to participate in party deliberations in the slating and nomination of candidates, their opportunity to register and vote, and hence their chance to directly influence the election returns and to secure the attention of the winning candidate. Statewide, however, the inquiry centers on the voters' direct or indirect influence on the elections of the state legislature as a whole. And, as in individual district cases, an equal protection violation may be found only where the electoral system substantially disadvantages certain voters in their opportunity to influence the political process effectively. In this context, such a finding of unconstitutionality must be supported by evidence of continued frustration of the will of a majority of the voters or effective denial to a minority of voters of a fair chance to influence the political process.
Based on these views, we would reject the District Court's apparent holding that any interference with an opportunity to elect a representative of one's choice would be sufficient to allege or make out an equal protection violation, unless justified by some acceptable state interest that the State would be required to demonstrate. In addition to being contrary to the above-described conception of an unconstitutional political gerrymander, such a low threshold for legal action would invite attack on all or almost all reapportionment statutes. District-based elections hardly ever produce a perfect fit between votes and representation. The one person, one vote imperative often mandates departure from this result as does the no-retrogression rule required by § 5 of the Voting Rights Act. Inviting attack on minor departures from some supposed norm would too much embroil the judiciary in second-guessing what has consistently been referred to as a political task for the legislature, a task that should not be monitored too closely unless the express or tacit goal is to effect its removal from legislative halls. We decline to take a major
step toward that end, which would be so much at odds with our ...