Mark Lamb projected to win Arizona GOP primary for 5th District seat

Former Pinal County Sheriff Mark Lamb is projected to win the Republican primary for Representative Andy Biggs’s seat in Arizona’s 5th Congressional District, according to Decision Desk HQ. The projection comes as Lamb, who has been a prominent figure in state politics, prepares to face a field of GOP candidates for the open seat.

Lamb’s campaign has been bolstered by high‑profile endorsements, most notably from former President Donald Trump, and backing from conservative groups that have rallied behind his platform. He previously sought statewide office in 2024, running for the U.S. Senate and losing to fellow Republican Kari Lake in the GOP primary. His experience as sheriff and his recent endorsements suggest a strong base of support within the party.

With the primary approaching, Lamb’s projected victory signals a consolidation of Republican support in the district. The outcome will set the stage for the general election, where the GOP nominee will face the incumbent or a new challenger in a district that has historically leaned Republican.