Mark Lamb holds a commanding lead in the Arizona 5th congressional district Republican primary as the former Pinal County sheriff with strong name recognition and Donald Trump’s endorsement, which traders view as decisive advantages in a crowded field. Recent polling from late 2025 showed him ahead by more than 50 points among likely GOP primary voters, reflecting his established profile from a prior U.S. Senate bid and law enforcement record. Jay Feely and Travis Grantham trail significantly, consistent with their lower visibility and limited polling support despite Feely’s name recognition from his NFL career. Allegations of misconduct reported against Lamb in May 2026 have not shifted the market consensus, with the July 21 primary date now the key remaining catalyst for any late movement.