Markets Flip as Cornyn Outperforms
John Cornyn defied expectations Tuesday night, holding Ken Paxton to a runoff and flipping from underdog to favorite in a race that has national Republicans openly worrying about losing Texas. Markets that gave Paxton an 83% win probability before polls closed now price Cornyn at 60% — a stunning reversal that reflects the four-term senator's ability to compete even in heavily Republican counties where the MAGA base was supposed to deliver for Paxton.
"Paxton went from 80% to win to coinflip today," noted @DustinGouker, capturing the whiplash in trader sentiment. The shift came as Cornyn largely held his own in counties where Paxton should have dominated, according to Politico analysis. Neither candidate cleared 50%, forcing a May 26 runoff that Senate Republicans desperately wanted to avoid.
The Establishment Scramble
Senate GOP leaders are now racing to secure a Trump endorsement for Cornyn before the runoff turns into a repeat of the primary bloodbath. Trump himself threw gasoline on the fire Thursday, warning Paxton it would be "bad for him" not to drop out if Trump backs Cornyn — then demanding whichever candidate doesn't get his endorsement exit the race entirely. Markets give Cornyn a 54% chance of securing that endorsement versus 33% for Paxton, per Polymarket.
The establishment push reflects deep anxiety about what a Paxton nomination would mean for November. Party insiders worry the scandal-plagued attorney general — who faces securities fraud charges and narrowly survived impeachment — would hand Democrats their first Texas Senate pickup since 1988. Lt. Gov. Dan Patrick's brutal assessment of third-place finisher Wesley Hunt reflects the stakes: "Wesley Hunt should have never gotten in this race." Hunt pulled 13.5%, potentially siphoning establishment votes from Cornyn.
Paxton's Leverage Play
Paxton isn't going quietly. Thursday, he floated conditions for dropping out: Senate Republicans would need to eliminate the filibuster and meet other demands. The proposal landed like a brick in establishment circles — this is a candidate threatening to blow up Senate procedure as the price of exit. Former Rep. Marjorie Taylor Greene fumed at Trump's demand that the non-endorsed candidate drop out, highlighting fractures in the MAGA coalition itself.
Meanwhile, Democrats nominated state Rep. James Talarico, a 36-year-old rising star who generated massive turnout in the primary. Republicans face a brutal choice: spend two months and millions of dollars destroying each other, or rally behind a candidate Trump may not pick. Ted Cruz is staying neutral. The next 12 weeks will determine whether Texas becomes competitive for the first time in a generation.
What Traders Are Watching
Trump's endorsement timing is now the single biggest variable. Senate Republicans are pleading for him to move fast, but Trump said only that he'll decide "soon." Every day without clarity extends the Republican civil war and burns resources that should be directed at Talarico. The Democrat's strong primary showing already has traders reassessing Texas's fundamental competitiveness — a state where no Democrat has won statewide office since 1994.
Cornyn's market flip from underdog to favorite happened in hours, not days. That velocity suggests traders believe his Tuesday performance changed Trump's calculus. But Paxton remains a MAGA darling who worked to overturn the 2020 election, and the base's appetite for rewarding that loyalty shouldn't be underestimated. The runoff odds could flip again with a single Truth Social post.
