The TX-20 district's strong Democratic partisan lean, reflected in a Cook Partisan Voter Index of D+12 or higher and consistent Solid Democratic ratings from Cook, Decision Desk HQ, Inside Elections, and Sabato's Crystal Ball, underpins the 94.5% trader consensus for the Democratic nominee. Incumbent Joaquin Castro secured renomination with 88% in the March 2026 primary and faces Republican Edgardo Baez and independent Anthony Tristan in the November general, with no recent polling or developments indicating a competitive shift. The seat's San Antonio-based demographics and history of large Democratic margins in presidential and House contests further anchor the implied probability. Late developments such as a major scandal, health event, or unanticipated national wave could still alter the outcome before Election Day.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedTX-20 House Election Winner
$27,061 Vol.
$27,061 Vol.
Democratic Party
95%
Republican Party
6%
$27,061 Vol.
$27,061 Vol.
Democratic Party
95%
Republican Party
6%
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, 11:24 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...The TX-20 district's strong Democratic partisan lean, reflected in a Cook Partisan Voter Index of D+12 or higher and consistent Solid Democratic ratings from Cook, Decision Desk HQ, Inside Elections, and Sabato's Crystal Ball, underpins the 94.5% trader consensus for the Democratic nominee. Incumbent Joaquin Castro secured renomination with 88% in the March 2026 primary and faces Republican Edgardo Baez and independent Anthony Tristan in the November general, with no recent polling or developments indicating a competitive shift. The seat's San Antonio-based demographics and history of large Democratic margins in presidential and House contests further anchor the implied probability. Late developments such as a major scandal, health event, or unanticipated national wave could still alter the outcome before Election Day.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated

Beware of external links.
Beware of external links.
Frequently Asked Questions