Arizona's 5th Congressional District remains a solidly Republican seat following the July 2026 primaries, where former Pinal County Sheriff Mark Lamb secured the GOP nomination with 58.7% of the vote after receiving President Trump's endorsement, while nurse Elizabeth Lee won the Democratic primary with 66%. The open seat, vacated by retiring Representative Andy Biggs, covers conservative-leaning areas in Maricopa and Pinal counties with a recent partisan lean exceeding 20 points. Lamb's primary victory despite prior personal allegations, combined with the district's consistent Republican performance in prior cycles and his fundraising edge, has shaped trader consensus around a strong Republican hold. The November 3 general election timeline leaves limited room for major shifts absent unforeseen developments.