Trump Endorsement and Big Money Collide as Cornyn-Paxton Runoff Reaches Final Hours
Why It Matters
Texas Republicans head to the polls Tuesday to decide one of the most consequential Senate primaries in recent state history. The outcome will determine the GOP’s standard-bearer against Democratic nominee James Talarico in what is shaping up to be a competitive general election — and could signal where the Texas Republican Party stands in the ongoing battle between its establishment wing and its populist base.
What Happened
After more than a year of campaigning, incumbent U.S. Senator John Cornyn and Texas Attorney General Ken Paxton are set to face off in Tuesday’s Republican primary runoff. Neither candidate secured an outright majority in the March 3 primary, forcing the overtime contest after U.S. Rep. Wesley Hunt drew enough votes to prevent a winner.
The race shifted dramatically earlier this week when President Donald Trump endorsed Paxton, citing the attorney general’s loyalty to the president during difficult moments — a pointed contrast with Cornyn, whom Trump faulted for expressing doubts about his electability in 2023. The endorsement broke from the preferences of Senate Majority Leader John Thune and much of the Washington Republican establishment, which has invested heavily in Cornyn’s campaign.
Senator Ted Cruz, who has remained neutral in the contest, acknowledged the endorsement’s weight. “Any observer will acknowledge that President Trump’s endorsement makes it significantly more likely that Ken Paxton wins,” Cruz said publicly this week, while stopping short of predicting the outcome.
By the Numbers
- $135 million — total spending across both campaigns and associated outside groups over the course of the primary battle
- 42% — Cornyn’s share of the March 3 primary vote, finishing first but short of the majority needed to avoid a runoff
- 40.5% — Paxton’s share in the initial primary
- 13.5% — the share captured by Rep. Wesley Hunt, whose exit from the race sent the contest to a runoff
- 13 months — the duration of the active primary campaign between the two candidates
The Case Each Candidate Is Making
Cornyn has centered his closing argument on electability. He contends that his record of winning statewide by wider margins than Trump himself demonstrates he is best positioned to preserve the Texas GOP’s three-decade grip on statewide offices — and to protect the Senate majority needed to advance the president’s legislative agenda.
“I won in 2020 by 10 points, and President Trump won Texas that same year by six points,” Cornyn said Monday. He argued that nominating Paxton would divert hundreds of millions of dollars in Republican resources to a Texas seat that should be safe, drawing funds away from competitive states.
Paxton, whose political identity is built on challenging the Republican establishment, has dismissed Cornyn’s record as ineffective and paints the senator as an obstacle to the administration’s priorities. He has repeatedly criticized the legislative filibuster and Senate norms that he says stall conservative governance, promising to take what he calls a “sledgehammer” to such conventions. “The MAGA agenda is dead under John Cornyn,” Paxton said in a recent television appearance. “He kills it every time.”
Since receiving Trump’s endorsement, Paxton’s campaign and its allied super PAC have shifted toward positive messaging around the president’s backing and have begun running ads targeting Talarico — a sign the Paxton operation is already looking past the primary. For more on the major donors and outside groups financing both sides of this race, see our full breakdown of the megadonors and dark money organizations bankrolling both campaigns.
Zoom Out
The Cornyn-Paxton contest is the latest — and largest — example of the internal Republican realignment playing out in deep-red states, where Trump loyalists have mounted sustained challenges to long-serving establishment figures. Runoff electorates in Texas, as in other states, historically skew toward more ideologically motivated voters, a structural factor that tends to benefit candidates aligned with the party’s base. Operatives uninvolved in the race have noted that this dynamic, compounded by the Trump endorsement, gives Paxton a structural edge heading into Tuesday.
What’s Next
Polls close Tuesday evening. The winner will face Democrat James Talarico in November in what both parties expect to be a harder-fought general election than Texas has seen in recent cycles. A Paxton nomination would likely prompt significant Democratic and Republican spending in the state, while a Cornyn win would be read as a rare check on Trump-aligned primary challenges to incumbent Republican senators.