A last-minute presidential endorsement has turned a Senate runoff into something much messier than anyone expected.

Nobody saw this coming — not John Cornyn, not Mitch McConnell, and apparently not even Trump’s own Senate allies. When the president endorsed Ken Paxton for U.S. Senate just two days into early voting, he didn’t just upend a Texas runoff. He sent a message to the entire Republican establishment: the party still runs through him, and he’ll remind you whenever he feels like it.

Political analyst Ross Hunt, principal of Hunt Research in Dallas, called it “somewhat surprising” — but he was being polite. Cornyn himself had told reporters earlier that week that a Trump endorsement was off the table. “The ship had sailed,” Cornyn said. Then the ship came back.

“I think a lot of what seems to be motivating the president is his own political and policy aims… right now, the Republican Party is completely owned by President Trump, and I think he feels the strength of that.”— Ross Hunt, Hunt Research

For Paxton, the timing is either a miracle or a very well-timed gift. Hunt believes the attorney general was already the slight favorite heading into the runoff — runoff electorates tend to skew more ideologically conservative, which plays to Paxton’s base. But Trump’s thumb on the scale makes him the clear frontrunner now. Not a lock. But close.

Can Cornyn still pull it off?

In theory, yes. Hunt’s early-vote analysis found that Cornyn-friendly counties — places like Travis County and parts of South Texas — were turning out at roughly the same pace as the March primary, maybe slightly better. But “roughly the same” isn’t a comeback. Cornyn needs a surge, not a steady pace. He’d also need to absorb a significant chunk of voters who originally backed George P. Bush — voters who are now up for grabs and don’t obviously belong to either camp.

If Cornyn somehow pulls it out, Hunt is clear: that’s an upset. A real one.

But here’s the bigger story — Texas is in play, period

Even if Paxton wins the runoff, Republicans may have a tougher November than they’re letting on. Hunt pointed to something that should make GOP strategists nervous: the Democratic primary this cycle saw a massive turnout surge. That kind of enthusiasm doesn’t just disappear. Hunt estimates it could shift the generic ballot by six to eight points compared to past cycles — enough to put Democratic Senate candidate James Terico within striking distance regardless of whether Cornyn or Paxton is the nominee.

Hunt’s honest read? Cornyn would be the stronger general election candidate. He has crossover appeal, he can consolidate the party, and Republican-leaning independents are more likely to show up for him. Paxton, by contrast, carries more baggage — ethical controversies, marital drama, and sharp attacks from within his own party, including former Governor Rick Perry calling him a candidate who “belongs in an actual swamp.”

“For better or worse, voters have extremely thick skin these days. The base isn’t going to hold the nasty words against him — but independents who might just stay home? That’s the real risk.”— Ross Hunt, Hunt Research

Hunt’s point is worth sitting with: the Republican base isn’t fleeing Paxton over the name-calling. But Republican-leaning independents who could quietly stay home on Election Day? That’s the quiet wildcard. And in a state that’s trending more competitive, you can’t afford to leave those voters on the couch.

Down-ballot, it gets complicated

Governor Greg Abbott is probably fine — his war chest and brand are in a league of their own. Dan Patrick too. But the attorney general’s race is a genuine toss-up, the state house has a lot of open and newly vulnerable seats, and if the top of the ticket is struggling, the ripple effects could reach farther than anyone expected this time last year.

For now, everyone’s watching Tuesday. Trump made his move. Texas gets to make its.