Incumbent Democratic Representative Jim Costa advanced from the June 2026 top-two primary alongside Republican Kyle Kirkland to contest the November general election in California’s 21st district. The seat carries a Cook Partisan Voter Index of D+5 and receives Likely Democratic or Safe Democratic ratings from major forecasters, reflecting its Central Valley voter base and registration edge for Democrats. These structural factors underpin the 91.5% implied probability traders assign to a Democratic victory. A realistic challenge would require an unexpected national Republican surge, sharply reduced Democratic turnout, or late developments such as a significant scandal or health issue affecting the incumbent that alter the race dynamics before Election Day.
Resumen experimental generado por IA con datos de Polymarket. Esto no es asesoramiento de trading y no influye en cómo se resuelve este mercado. · ActualizadoCA-21 Ganador de las elecciones de la Cámara
$24,749 Vol.
$24,749 Vol.
Partido Demócrata
92%
Partido Republicano
9%
$24,749 Vol.
$24,749 Vol.
Partido Demócrata
92%
Partido Republicano
9%
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/).
Mercado abierto: Jan 28, 2026, 12:08 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 Democratic Representative Jim Costa advanced from the June 2026 top-two primary alongside Republican Kyle Kirkland to contest the November general election in California’s 21st district. The seat carries a Cook Partisan Voter Index of D+5 and receives Likely Democratic or Safe Democratic ratings from major forecasters, reflecting its Central Valley voter base and registration edge for Democrats. These structural factors underpin the 91.5% implied probability traders assign to a Democratic victory. A realistic challenge would require an unexpected national Republican surge, sharply reduced Democratic turnout, or late developments such as a significant scandal or health issue affecting the incumbent that alter the race dynamics before Election Day.
Resumen experimental generado por IA con datos de Polymarket. Esto no es asesoramiento de trading y no influye en cómo se resuelve este mercado. · Actualizado

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