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Mark Lamb Files to Run for Arizona’s Open CD-5 Seat

His filing sets up a high-profile GOP primary in a safely Republican East Valley district.

Overview

  • The former Pinal County sheriff submitted a statement of interest on Monday and launched a basic campaign sign-up page.
  • The seat opened after U.S. Rep. Andy Biggs announced a 2026 gubernatorial bid.
  • Lamb previously ran for U.S. Senate in 2024 and lost the Republican primary to Kari Lake.
  • His record draws scrutiny for ties to the constitutional sheriff movement, work with True the Vote, appearances on QAnon-linked programs, and past Great Replacement remarks.
  • If he qualifies for the ballot, he would join a crowded Republican field that includes Travis Grantham, Jay Feely, Alex Stovall, Daniel Keenan, and Linda Schaefer.