Incumbent Republican Brian Mast faces Democratic nominee James Martin in Florida’s 21st congressional district on November 3, 2026. The district’s R+7 partisan voting index, Mast’s 61.8% victory in 2024, and consistent “solid” or “safe” Republican ratings from forecasters such as the Cook Political Report and Sabato’s Crystal Ball underpin the 93% Republican implied probability. Mast advanced without primary opposition after the August 18 contest, while Martin narrowly won the Democratic nomination. Florida’s recent congressional map further favors GOP candidates statewide. Potential shifts remain limited to late developments such as candidate health issues, major scandals, or an unusually strong national Democratic midterm wave that overcomes the district’s structural advantages.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedFL-21 House Election Winner
$14,472 Vol.
$14,472 Vol.
Republican Party
93%
Democratic Party
7%
$14,472 Vol.
$14,472 Vol.
Republican Party
93%
Democratic Party
7%
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 28, 2026, 10:58 AM 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...Incumbent Republican Brian Mast faces Democratic nominee James Martin in Florida’s 21st congressional district on November 3, 2026. The district’s R+7 partisan voting index, Mast’s 61.8% victory in 2024, and consistent “solid” or “safe” Republican ratings from forecasters such as the Cook Political Report and Sabato’s Crystal Ball underpin the 93% Republican implied probability. Mast advanced without primary opposition after the August 18 contest, while Martin narrowly won the Democratic nomination. Florida’s recent congressional map further favors GOP candidates statewide. Potential shifts remain limited to late developments such as candidate health issues, major scandals, or an unusually strong national Democratic midterm wave that overcomes the district’s structural advantages.
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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