The open seat created by Republican incumbent Andy Biggs’s retirement to pursue the Arizona governorship has reinforced trader consensus around an 82.5% probability for the Republican nominee in the November 3, 2026 general election. The solidly Republican district, which Biggs carried with 60.4% in 2024, features a July 21 primary among Mark Lamb, Travis Grantham, Mike Gross, and Daniel Keenan, with Lamb holding a commanding lead in early polling due to his statewide name recognition and law-enforcement background. Democratic primary contenders remain fragmented and lack comparable fundraising or profile, consistent with the district’s structural partisan composition. Upcoming primary results and general-election turnout patterns represent the primary near-term variables that could shift implied probabilities before November.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedAZ-05 House Election Winner
Republican Party
84%
Democratic Party
14%
Republican Party
84%
Democratic Party
14%
A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time all of the 2026 House elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican parties will be considered a member of one of these parties based on the party with which they most recently expressed their intent to caucus at the time all of the House elections are conclusively called by this market's resolution sources.
This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the United States government, specifically the Federal Election Commission (https://www.fec.gov/).
Market Opened: Jan 27, 2026, 11:54 PM ET
Resolver
0x2F5e3684c...A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time all of the 2026 House elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican parties will be considered a member of one of these parties based on the party with which they most recently expressed their intent to caucus at the time all of the House elections are conclusively called by this market's resolution sources.
This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the United States government, specifically the Federal Election Commission (https://www.fec.gov/).
Resolver
0x2F5e3684c...The open seat created by Republican incumbent Andy Biggs’s retirement to pursue the Arizona governorship has reinforced trader consensus around an 82.5% probability for the Republican nominee in the November 3, 2026 general election. The solidly Republican district, which Biggs carried with 60.4% in 2024, features a July 21 primary among Mark Lamb, Travis Grantham, Mike Gross, and Daniel Keenan, with Lamb holding a commanding lead in early polling due to his statewide name recognition and law-enforcement background. Democratic primary contenders remain fragmented and lack comparable fundraising or profile, consistent with the district’s structural partisan composition. Upcoming primary results and general-election turnout patterns represent the primary near-term variables that could shift implied probabilities before November.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated


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