Page:Arizona State Legislature v. Arizona Independent Redistricting Comm’n.pdf/14

10 Legislature have standing to bring this suit? Trained on “whether the plaintiff is [a] proper party to bring [a particular lawsuit,]” standing is “[o]ne element” of the Constitution’s case-or-controversy limitation on federal judicial authority, expressed in Article III of the Constitu­tion. Raines v. Byrd, 521 U. S. 811, 818 (1997). “To qual­ify as a party with standing to litigate,” the Arizona Legis­lature “must show, first and foremost,” injury in the form of “ ‘invasion of a legally protected interest’ that is ‘con­crete and particularized’ and ‘actual or imminent.’ ” Arizonans for Official English v. Arizona, 520 U. S. 43, 64 (1997) (quoting Lujan v. Defenders of Wildlife, 504 U. S. 555, 560 (1992)). The Legislature’s injury also must be “fairly traceable to the challenged action” and “redressable by a favorable ruling.” Clapper v. Amnesty Int’l USA, 568 U. S. ___, ___ (2013) (slip op., at 10) (internal quotation marks omitted).

The Arizona Legislature maintains that the Elections Clause vests in it “primary responsibility” for redistricting. Brief for Appellant 51, 53. To exercise that responsibility, the Legislature urges, it must have at least the opportunity to engage (or decline to engage) in redistricting before the State may involve other actors in the redistricting process. See id., at 51–53. Proposition 106, which gives the AIRC binding authority over redistricting, regardless of the Legislature’s action or inaction, strips the Legisla­ture of its alleged prerogative to initiate redistricting. That asserted deprivation would be remedied by a court order enjoining the enforcement of Proposition 106. Although we conclude that the Arizona Legislature does not have the exclusive, constitutionally guarded role it asserts, see infra, at –35, one must not “confus[e] weakness on the merits with absence of Article III standing.” Davis v. United States, 564 U. S. ___, ___, n. 10 (2011) (slip op., at 19, n. 10); see Warth v. Seldin, 422 U. S. 490, 500 (1975) (standing “often turns on the nature and source of the