Mark Lamb holds a commanding lead in the AZ-05 House race due to the district’s consistent Republican lean, reflected in the 2024 result of roughly R+21 and current forecasts projecting a double-digit GOP margin. As an open seat following incumbent Andy Biggs’s decision to run for governor, Lamb secured the Republican nomination in July with 58.7% of the primary vote and benefits from Trump endorsement plus a substantial fundraising edge over Democratic nominee Elizabeth Lee. Forecasters rate the contest Solid or Safe Republican, aligning with trader consensus that views the outcome as low-risk barring major late developments. Potential shifts could arise from turnout drops among moderate or LDS voters amid recent misconduct allegations against Lamb, though the structural partisan advantage makes a reversal unlikely before the November 3 general election.