Former Pinal County Sheriff Mark Lamb dominates trader consensus at 89% implied probability to win Arizona's 5th Congressional District Republican primary on July 21, 2026, following Rep. Andy Biggs' decision to run for governor and leave the safely Republican (R+10) seat open. Lamb's lead stems from high-profile endorsements by President Trump in November 2025 and Club for Growth in December, bolstering his appeal among GOP base voters with his "God, family, freedom" platform and law enforcement background. State Rep. Travis Grantham trails at 7% amid limited momentum, while former NFL kicker Jay Feely holds 4.8% as a longshot. Lamb's recent no-show at an April 2 debate drew criticism but failed to shift odds significantly, with filing deadline looming April 6 potentially clarifying the field.
Experimental AI-generated summary referencing Polymarket data · UpdatedMark Lamb 88%
Travis Grantham 6.8%
Jay Feely 4.7%
Mark Lamb
88%
Travis Grantham
7%
Jay Feely
5%
Mark Lamb 88%
Travis Grantham 6.8%
Jay Feely 4.7%
Mark Lamb
88%
Travis Grantham
7%
Jay Feely
5%
If no nominee is announced by November 3, 2026, 11:59PM ET, this market will resolve to "Other".
The resolution source for this market will be a consensus of official Republican sources, including https://www.rnc.org/.
Any replacement of the nominee before election day will not change the resolution of the market.
Market Opened: Nov 25, 2025, 5:27 PM ET
Resolver
0x2F5e3684c...If no nominee is announced by November 3, 2026, 11:59PM ET, this market will resolve to "Other".
The resolution source for this market will be a consensus of official Republican sources, including https://www.rnc.org/.
Any replacement of the nominee before election day will not change the resolution of the market.
Resolver
0x2F5e3684c...Former Pinal County Sheriff Mark Lamb dominates trader consensus at 89% implied probability to win Arizona's 5th Congressional District Republican primary on July 21, 2026, following Rep. Andy Biggs' decision to run for governor and leave the safely Republican (R+10) seat open. Lamb's lead stems from high-profile endorsements by President Trump in November 2025 and Club for Growth in December, bolstering his appeal among GOP base voters with his "God, family, freedom" platform and law enforcement background. State Rep. Travis Grantham trails at 7% amid limited momentum, while former NFL kicker Jay Feely holds 4.8% as a longshot. Lamb's recent no-show at an April 2 debate drew criticism but failed to shift odds significantly, with filing deadline looming April 6 potentially clarifying the field.
Experimental AI-generated summary referencing Polymarket data · Updated

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