Incumbent Democrat Jahana Hayes secured her party's nomination without opposition in the August 11 primary for Connecticut's 5th district, while Republican Chris Shea prevailed in a contested primary to become the general election nominee. The district carries a D+3 Partisan Voter Index, and forecasters from the Cook Political Report, Sabato's Crystal Ball, and others rate the seat Solid or Likely Democratic ahead of the November 3 contest. Hayes's prior reelection with 53.4 percent in 2024, combined with the structural lean and her established fundraising, underpin trader consensus reflected in the 94.2 percent Democratic probability. A substantial Republican wave in the national environment, unusually high unaffiliated turnout favoring Shea, or late developments altering voter sentiment remain the main variables that could narrow the margin.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedCT-05 House Election Winner
Democratic Party
94%
Republican Party
5%
Democratic Party
94%
Republican Party
5%
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: Dec 16, 2025, 11:47 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 Democrat Jahana Hayes secured her party's nomination without opposition in the August 11 primary for Connecticut's 5th district, while Republican Chris Shea prevailed in a contested primary to become the general election nominee. The district carries a D+3 Partisan Voter Index, and forecasters from the Cook Political Report, Sabato's Crystal Ball, and others rate the seat Solid or Likely Democratic ahead of the November 3 contest. Hayes's prior reelection with 53.4 percent in 2024, combined with the structural lean and her established fundraising, underpin trader consensus reflected in the 94.2 percent Democratic probability. A substantial Republican wave in the national environment, unusually high unaffiliated turnout favoring Shea, or late developments altering voter sentiment remain the main variables that could narrow the margin.
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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