Incumbent Democrat Mark DeSaulnier's strong primary performance on June 2, 2026, where he secured nearly 60% of the vote against a fragmented field, has reinforced trader expectations for a Democratic victory in California's 10th congressional district on November 3. The district's D+18 Partisan Voter Index, combined with consistent "Solid Democratic" or "Safe Democratic" ratings from forecasters such as the Cook Political Report, Sabato's Crystal Ball, and Decision Desk HQ, reflects its established partisan composition in Alameda and Contra Costa counties. Limited Republican fundraising and the absence of competitive challengers further support the current 96% implied probability for the Democratic nominee. Late developments capable of narrowing this margin would require significant shifts, such as major scandals, health-related withdrawals, or an unprecedented national political realignment altering local turnout patterns.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedCA-10 House Election Winner
CA-10 House Election Winner
$23,951 Vol.
$23,951 Vol.
Nov 2, 2026
Democratic Party
96%
Republican Party
5%
$23,951 Vol.
$23,951 Vol.
Nov 2, 2026
Democratic Party
$12,007 Vol.
96%
Republican Party
$11,944 Vol.
5%
This market will resolve according to the party of the candidate who wins the CA-10 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026.
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/).Incumbent Democrat Mark DeSaulnier's strong primary performance on June 2, 2026, where he secured nearly 60% of the vote against a fragmented field, has reinforced trader expectations for a Democratic victory in California's 10th congressional district on November 3. The district's D+18 Partisan Voter Index, combined with consistent "Solid Democratic" or "Safe Democratic" ratings from forecasters such as the Cook Political Report, Sabato's Crystal Ball, and Decision Desk HQ, reflects its established partisan composition in Alameda and Contra Costa counties. Limited Republican fundraising and the absence of competitive challengers further support the current 96% implied probability for the Democratic nominee. Late developments capable of narrowing this margin would require significant shifts, such as major scandals, health-related withdrawals, or an unprecedented national political realignment altering local turnout patterns.
This market will resolve according to the party of the candidate who wins the CA-10 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026.
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/).
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, 11:56 PM ET
Volume
$23,951End Date
Nov 3, 2026Market Opened
Jan 27, 2026, 11:56 PM ETResolver
0x2F5e3684c...This market will resolve according to the party of the candidate who wins the CA-10 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026.
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/).Incumbent Democrat Mark DeSaulnier's strong primary performance on June 2, 2026, where he secured nearly 60% of the vote against a fragmented field, has reinforced trader expectations for a Democratic victory in California's 10th congressional district on November 3. The district's D+18 Partisan Voter Index, combined with consistent "Solid Democratic" or "Safe Democratic" ratings from forecasters such as the Cook Political Report, Sabato's Crystal Ball, and Decision Desk HQ, reflects its established partisan composition in Alameda and Contra Costa counties. Limited Republican fundraising and the absence of competitive challengers further support the current 96% implied probability for the Democratic nominee. Late developments capable of narrowing this margin would require significant shifts, such as major scandals, health-related withdrawals, or an unprecedented national political realignment altering local turnout patterns.
This market will resolve according to the party of the candidate who wins the CA-10 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026.
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/).
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/).
Volume
$23,951End Date
Nov 3, 2026Market Opened
Jan 27, 2026, 11:56 PM ETResolver
0x2F5e3684c...Incumbent Democrat Mark DeSaulnier's strong primary performance on June 2, 2026, where he secured nearly 60% of the vote against a fragmented field, has reinforced trader expectations for a Democratic victory in California's 10th congressional district on November 3. The district's D+18 Partisan Voter Index, combined with consistent "Solid Democratic" or "Safe Democratic" ratings from forecasters such as the Cook Political Report, Sabato's Crystal Ball, and Decision Desk HQ, reflects its established partisan composition in Alameda and Contra Costa counties. Limited Republican fundraising and the absence of competitive challengers further support the current 96% implied probability for the Democratic nominee. Late developments capable of narrowing this margin would require significant shifts, such as major scandals, health-related withdrawals, or an unprecedented national political realignment altering local turnout patterns.
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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