Polymarket
KalshiTX-10 Is Priced as a Party-Line Hold With Michael McCaul Off the Ballot
The TX-10 House race 2026 puts Chris Gober, the Republican nominee, against Caitlin Rourk, the Democrat, for a seat with no incumbent on the ballot, and the market treats the Republican Party as the favorite on the district's party line rather than on either name. Michael McCaul, the Austin Republican who holds the seat, is in neither party's 2026 primary, and the map Texas enacted in 2025 changed the district's counties far more than its 2024 vote. Texas voters decide it on November 3, 2026, with early voting from October 19 to October 30; the live board above carries the current number.
What the TX-10 price rests on
The seat on the 2026 ballot is drawn under PlanC2333, the congressional plan the 89th Legislature enacted in its second called session of 2025. The Texas Legislative Council lists it as the plan in effect for the 2026 elections, and members elected under the previous plan, PlanC2193, keep representing their old districts until the new Congress meets in January 2027. The council's population report for the new plan, dated August 18, 2025, puts ten counties in TX-10 whole: Brazos, Burleson, Grimes, Houston, Lee, Leon, Madison, Polk, San Jacinto and Trinity, with 62% of Walker County, 21% of Travis County and a sliver of Bastrop County. Brazos County, with 233,849 residents, and the Travis piece, with 277,284, together hold about two thirds of the district's 766,987 people.
That is a different district on paper from the one McCaul won in 2024. The old TX-10 took all of Austin, Colorado, Fayette, Waller and Washington counties, more than half of Bastrop County, about a seventh of Travis County and a small part of Williamson County; the new one gives those up and adds Houston, Leon, Polk, San Jacinto and Trinity counties and most of Walker County. The Travis share grew, from 185,436 residents to 277,284.
What did not move is the vote. The council's analysis of the November 5, 2024 general election within the new lines gives the Republican presidential ticket 60.5% of the vote to 37.9% for the Democratic ticket, and the Republican Senate nominee 58.5% to 39.3%. Within the old lines the same election went 61.6% to 36.8% for president and 59.4% to 38.2% for senator. That is the structural read: the redraw swapped counties without moving either Republican's share of the vote by much more than a point, so a seat both Republicans at the top of the 2024 ticket carried by roughly twenty points is priced as a Republican hold before anyone asks who the nominees are.
The price takes no incumbent with it. The Clerk of the House lists McCaul, of Austin, elected November 5, 2024 and sworn January 3, 2025, as the member for TX-10, but the Secretary of State's list of qualified candidates for the March 3, 2026 Republican primary does not include him, and Ballotpedia records that he retired from public office. A long-serving member's personal vote is not in the 2026 number in either direction.
The nominees were settled on primary night. Gober won the March 3, 2026 Republican primary outright with 38,541 votes, 51.2% of a ten-candidate field, per the Secretary of State's official results, so the party skipped a runoff. Rourk won the Democratic primary with 32,716 votes, 60.8%, ahead of Dawn Marshall and Bernie Reyna. The certified general-election list names two candidates for the seat: Gober, an attorney, for the Republican Party and Rourk for the Democratic Party.
The outside reads agree on direction and differ on degree. Ballotpedia's weekly table for October 20, 2026 has the Cook Political Report and Inside Elections at Solid Republican, Sabato's Crystal Ball at Safe Republican and Decision Desk at Likely Republican, the same four ratings it showed on September 29. Federal Election Commission filings compiled by Ballotpedia show Gober with $3.10M raised and $165.6K on hand through October 14, 2026, and Rourk with $531.0K raised and $112.1K on hand through September 30, 2026. A nominee with the map, the money and three of four top ratings is priced as the favorite.
The price got there early. Polymarket's Republican contract opened at 65% on January 29, 2026, printed 83% on primary day, March 3, and reached 91.5% on October 1, 2026. As of October 23, 2026, Kalshi and Polymarket both had the Republican Party holding TX-10 at 91% and the Democratic Party at 10%, which treats a Democratic pickup as about a one-in-ten outcome: unlikely on these lines, not ruled out.
The case against the TX-10 read
The strongest case against the read is that the redraw made the district more Austin-facing at the same time as the incumbent left. More than a third of the new district's residents live in the Travis County piece, up from under a quarter, and a midterm electorate is a smaller and differently composed one than the 2024 baseline describes: within the new lines, 259,588 ballots were cast in the 2022 general election, 51.6% of registration, against 355,103 in 2024, 66.6%. The Democratic primary drew 53,793 votes for the seat on March 3, 2026 against 75,204 in the Republican primary, a narrower gap than the 2024 general-election margin. The only public poll Ballotpedia lists, by Change Research for the Rourk campaign from September 18 to 22, 2026, had Gober ahead 48 to 41 among likely voters, with 11 undecided. And Decision Desk's Likely Republican rating sits a step closer than the other three. A reader who holds this view sees an open seat in a midterm, a seven-point gap in a sponsored poll and, as of October 23, 2026, a statewide Senate race on the same ballot that both venues lean Democratic, and asks why the price sits at nine in ten.
The answer the price gives is the baseline: both 2024 Republicans carried these exact lines by about twenty points, the Republican nominee won his primary without a runoff, and he has raised roughly six times what his opponent has. A campaign's own poll showing it seven points down is not evidence that the district has moved.
What changes the TX-10 read
The read is wrong if the November electorate on these lines votes closer to the Democratic primary turnout than to the 2024 presidential result. The dated tests:
• Early voting, October 19 to October 30, 2026: Brazos County sits wholly inside TX-10 and is the cleanest early read; Travis County and Walker County are split with other districts, so their totals are read with care.
• Mail ballots: applications must be received by October 23, 2026, and a ballot postmarked by 7 p.m. on election day counts if it arrives by 5 p.m. on November 4, 2026.
• Pre-general reports: due at the Federal Election Commission on October 22, 2026, with books closed October 14; Rourk's pre-general totals will show whether the money gap narrowed in October.
• Rating changes: a move by Decision Desk to Lean Republican, or by any of the other three off Solid or Safe, would say outside analysts see the Travis shift as real.
• Election night, November 3, 2026: a consensus media projection lets Kalshi settle early; a close count would delay the call.
When the TX-10 market resolves
Both venues price the party, not the person, and both settle off the November 3, 2026 general election, on different clocks. Kalshi's KXHOUSERACE-TX10-26 contracts, open since January 7, 2026, pay Yes if the House member sworn in for TX-10 for the term beginning in 2027 is a member of the named party; Kalshi may settle early once a consensus of media organizations projects the winner, expects settlement on January 4, 2027 and lists November 3, 2027 as the latest expiration. Polymarket's TX-10 House Election Winner contracts pay on the party of the candidate who wins the seat, judged by ballot-listed affiliation when all 2026 House elections are conclusively called by a consensus of credible reporting, with the Federal Election Commission's official results deciding any ambiguity. Kalshi prints Gober's and Rourk's names beside its two contracts and Polymarket lists Chris Gober (R) and Caitlin Rourk (D); the names are labels, and settlement reads party alone.
Related Texas markets around TX-10
Two other Texas House seats the site prices were reshaped by the same plan and are open in 2026: TX-21, left open when Chip Roy ran for attorney general, and TX-35, rebuilt around Bexar and Guadalupe counties. The top of the November 3, 2026 ballot, the Texas Senate race and the governor's race, sets the turnout that decides an open House seat like this one. Every Texas race the site prices is on the elections page, and the wider desk is on the politics hub.
