Page:Arizona State Legislature v. Arizona Independent Redistricting Comm’n.pdf/5

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delivered the opinion of the Court.

This case concerns an endeavor by Arizona voters to address the problem of partisan gerrymandering—the drawing of legislative district lines to subordinate adher­ents of one political party and entrench a rival party in power. “[P]artisan gerrymanders,” this Court has recog­nized, “[are incompatible] with democratic principles.” Vieth v. Jubelirer, 541 U. S. 267, 292 (2004) (plurality opinion); id., at 316 (, concurring in judg­ment). Even so, the Court in Vieth did not grant relief on the plaintiffs’ partisan gerrymander claim. The plurality held the matter nonjusticiable. Id., at 281. found no standard workable in that case, but left open the possibility that a suitable standard might be identified in later litigation. Id., at 317.