For most of 2025, the Texas Senate polls told one story and the prediction markets told another. That gap has closed. As of late April 2026, Polymarket prices Ken Paxton at 60% to win the May 26 Republican Senate primary runoff against incumbent John Cornyn, with $16 million in trading volume on that single contract. Republicans price as 56% favorites to hold the seat in November. State Representative James Talarico is the de facto Democratic nominee, with Polymarket pricing the Talarico-vs-Paxton matchup at 58% likelihood as the November ballot.
The combined market signal: Paxton-vs-Talarico is the most-likely race; Republicans are favored but not heavily; and the Senate as a whole is more competitive than people think (Polymarket prices Democrats to win the chamber at 52%).
The current price stack
| Candidate | Implied | Prob. | Δ pp |
|---|---|---|---|
| Paxton wins GOP runoff (May 26) | | 60% | — |
| Talarico-vs-Paxton matchup in November | | 58% | — |
| Republican wins Texas Senate seat | | 56% | — |
| Democrats win the US Senate in 2026 | | 52% | — |
The Talarico-vs-Paxton number at 58% is the most-traded matchup contract; the alternative paths (Cornyn-vs-Crockett, Cornyn-vs-Talarico) have been compressing as the runoff favorite has crystallized. Cornyn at 41% in the runoff implies a real but trailing chance.
Why the markets price Paxton ahead
Three drivers have moved Paxton from a coin-flip in August polling to a 60% favorite in late-April markets.
Primary turnout structure. The March 3 primary saw Cornyn at 43% and Paxton at 41%, with the rest scattered. Runoff dynamics — lower turnout, more activist-skewed electorate — favor Paxton’s base. Texas runoff history strongly skews to whichever candidate is more aligned with primary-voter intensity.
Trump endorsement weight. A Trump primary endorsement, when it lands cleanly, has historically been worth 10–15 points in modern Republican runoffs. Markets price endorsement signal heavily even when it has not been formalized.
Cornyn’s incumbent disadvantage. Long-tenure incumbents in Texas Republican primaries have lost more often than not since 2016. Cornyn’s 43% primary share is the floor; his runoff ceiling is the question.
The Emerson polling has been the closest to the market. Their August survey put Paxton at 29% to Cornyn’s 30% with 37% undecided. As that undecided segment has moved, it has moved more toward Paxton than Cornyn, consistent with the runoff price action.
The general-election story
Republicans at 56% to hold the seat is a smaller margin than Texas Republicans are accustomed to. Three things explain the relative competitiveness:
Talarico is a strong nominee. A Methodist seminarian and former teacher, Talarico has the polling profile (Hispanic-Catholic appeal, suburban-college reach) that has historically tightened Texas margins. Allred ran a similar profile in 2024 and lost by 8.5 points; Talarico’s polling has been closer.
Paxton’s general-election baggage. The 2023 impeachment, securities fraud charges (since dismissed), and ongoing legal questions are priced into general-election markets in a way they are not into primary markets. A Cornyn-Talarico race would have compressed Democratic odds to ~35%; Paxton-Talarico keeps them at 42%.
National environment. The Senate-wide market has Democrats at 52% to take the chamber. If that holds, every competitive Senate race tightens, including Texas.
How to use this market
For traders, the highest-information contract is the runoff itself, ending May 26. With $16M in volume and clear divergence between primary polling and market pricing, it is one of the most-watched midterm contracts on Polymarket. Liquidity collapses after May 26 regardless of outcome — the market either resolves and the next interesting contract is the November head-to-head, or it surprises and re-rates the entire seat.
The general-election contract is more interesting as a cross-asset signal. If Republicans become 50/50 to hold Texas, the broader Senate market for Democratic majority will price above 60%. Watch the two together.
For traders coming from the 2028 Democratic primary market, Talarico’s general-election performance is one of the inputs that will reshape the post-2026 candidate pipeline. A loss-but-close Talarico becomes a 2028 governor or 2030 Senate candidate; a win redraws the entire Senate-Dem landscape.
For new readers, our Polymarket explained primer walks through how primary-runoff markets resolve and what to watch for.
Common questions
Who is leading the Texas Senate polls in 2026?
Polymarket prices Ken Paxton at 60% to win the GOP Senate primary runoff on May 26, with John Cornyn at 41%. James Talarico is the de facto Democratic nominee. The Republican party is priced at 56% to hold the seat in the November general election.
When is the Texas GOP Senate runoff?
May 26, 2026. Polymarket lists a dedicated runoff contract with $16M in trading volume — among the deepest primary-runoff contracts ever priced.
Is Colin Allred running for Senate again?
No. Allred exited the race on December 8, 2025. James Talarico is the Democratic nominee, with Jasmine Crockett also having entered the race after Allred's departure.
Why is the general-election price so close (56-44)?
Three factors: Talarico's polling profile is stronger than past Democratic candidates, Paxton carries general-election baggage that Cornyn would not, and the broader Senate map is favorable to Democrats in 2026 (Polymarket prices Dems at 52% to take the chamber).
How accurate has Polymarket been on Senate races?
Polymarket's call accuracy on US Senate races has been roughly 90%+ a month before resolution, comparable to leading election forecast models like 538 and Decision Desk.
When does the general-election market resolve?
On the certified November 2026 election results, typically within two weeks of Election Day.
