How have courts interpreted the constitution in the context of voting rights issues?

Pub. Integrity All., Inc. v. City of Tucson, 836 F.3d 1019, 1028 (9th Cir. 2016) (en banc) (noting "our democratic federalism [is] a system that permits states to serve 'as laboratories for experimentation to devise various solutions where the best solution is far from clear.'" (quoting Ariz. State Legislature v. Ariz. Indep. Redistricting Comm'n, 576 U.S. 787, 817 (2015))). In the circumstances of this case, the Constitution does not mandate that the expanded access to the ballot box be extended equally to another, distinct category of voters.