Mark Lamb defeats Daniel Keenan in the Republican primary for Arizona's 5th Congressional District on July 21, 2026
Mark Lamb won the Republican primary for Arizona's 5th Congressional District on July 21, 2026, defeating Daniel Keenan despite being outfunded. The race emerged after incumbent Rep. Andy Biggs chose to run for governor instead of seeking reelection. Lamb's victory was bolstered by significant endorsements, while Keenan led in fundraising efforts.
Key Points
- Mark Lamb defeated Daniel Keenan in the Arizona 5th District Republican primary
- Incumbent Andy Biggs vacated the seat to pursue a gubernatorial campaign
- Lamb won despite a fundraising disadvantage ($1.2M vs. Keenan's $1.85M) but benefited from stronger endorsements