Public Integrity Alliance, Inc. v. City of Tucson, 805 F.3d 876

Tucson elects six council members from six equal-population wards; candidates must reside in the ward they seek.
Since 1930 Tucson used a hybrid system: ward-based partisan primaries (only ward residents vote) followed by at-large general elections (all city voters vote for each ward’s nominee).
Council terms are four years and staggered; only half the city votes in any given primary cycle, so most city voters cannot vote in the primary that effectively determines some at-large council seats.
Plaintiffs (five voters and a nonprofit) challenged the hybrid system as violating federal equal protection and Arizona constitutional guarantees by excluding most city voters from primaries that effectively select their at-large representatives.
The district court upheld the system; the Ninth Circuit majority reversed, concluding the hybrid scheme unlawfully disenfranchises constituents in violation of one-person, one-vote principles.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether Tucson’s ward-based primaries combined with at‑large general elections (the hybrid system) violate the Equal Protection Clause by excluding most city residents from participating in the decisive nominating stage for at‑large council members	Hybrid system unlawfully excludes out-of-ward constituents from the primary stage of a single, unitary election process; because councilmembers represent the entire city, all city voters must have equal opportunity to participate in every stage that effectively selects them	Primary and general are distinct contests; wards may limit primary participation to ward residents (a reasonable residency-based electoral design) and the system furthers legitimate interests (geographic representation); defer under Burdick sliding-scale review	Majority: Reversed — primary and general are two parts of a single selection process; excluding out-of-ward voters from primaries that effectively determine at-large representatives violates one-person, one-vote/equal protection. Dissent: System is constitutional; scrutiny should be deferential and Tucson’s interests justify the hybrid scheme.

United States v. Classic, 313 U.S. 299 (1941) (primary and general can be a unitary process; primary votes are protected)
Smith v. Allwright, 321 U.S. 649 (1944) (racially exclusive primaries invalid; primary and general treated as parts of single electoral process)
Gray v. Sanders, 372 U.S. 368 (1963) (one person, one vote: once constituency is designated, all participants must have equal weight)
Reynolds v. Sims, 377 U.S. 533 (1964) (one person, one vote principles in legislative representation)
Fortson v. Dorsey, 379 U.S. 433 (1965) (elected officials represent all who elect them; attention to whole constituency)
Burdick v. Takushi, 504 U.S. 428 (1992) (Anderson/Burdick framework for assessing burdens on voting rights; sliding-scale scrutiny)
Holt Civic Club v. City of Tuscaloosa, 439 U.S. 60 (1978) (limits on extending franchise to non-residents; state discretion in election design)
Dusch v. Davis, 387 U.S. 112 (1967) (upholding candidate residency requirements)
Dallas County v. Reese, 421 U.S. 477 (1975) (upholding candidate-residency requirements)