Texas Decides Tonight: How the Most Expensive Senate Primary in American History Came Down to One Runoff Between a Four-Term Incumbent and a Trump-Endorsed Scandal-Plagued Attorney General

Polls across most of Texas closed at 8 p.m. Central on Tuesday night, and with them closed one of the most consequential Republican primaries in the 2026 midterm cycle. The Texas Senate runoff between incumbent Senator John Cornyn and Attorney General Ken Paxton — a race that has consumed more than $165 million in campaign and super PAC spending, that absorbed a last-minute Trump endorsement of Paxton just one week before the vote, and that has exposed a fissure in the Republican Party between its Washington establishment wing and its MAGA base that Senate Majority Leader John Thune and his allies have been unable to paper over — is tonight's marquee event. Its outcome will shape not just who represents Texas in the United States Senate beginning in January 2027, but what kind of Republican Party emerges from the 2026 midterm cycle, whether James Talarico's Democrats have a realistic path to their first Texas Senate seat in more than thirty years, and how much weight a Trump endorsement delivered in the final week of a campaign actually carries when the candidate being endorsed has the most scandal-ridden record of any major Republican seeking statewide office in the country.

The path to this runoff began on March 3, 2026 — Texas's first primary of the midterm cycle and the nation's first major electoral test of the year, held in a state that had just lived through the Iran war's opening strikes, elevated gasoline prices, and the political reverberations of Maduro's capture in Venezuela. More than 2.5 million early votes were cast before March 3, the highest ever recorded for a Texas midterm primary, a figure that reflects both the genuine intensity of the races and the unusual degree of national attention focused on a state that had not seriously contested a statewide race in years.

The Democratic Senate primary produced a result that surprised most observers not in its winner but in its clarity. James Talarico, the 34-year-old state representative from Round Rock who had previously taught at a San Antonio high school and whose campaign framed itself around economic populism and working-class identity rather than the social justice messaging that characterised other Democratic Senate efforts, defeated Congresswoman Jasmine Crockett with 53.1 percent of the vote to Crockett's 45.6 percent with 85 percent of the vote reported. It was a margin that most pre-primary polling had not fully captured, and the geographic breadth of Talarico's coalition — carrying Travis County by 52 points and Hays County by 47, while also running up significant leads in heavily Hispanic South Texas counties including Webb and Hidalgo — suggested a candidate capable of assembling a coalition that went beyond the party's reliable urban core. Crockett conceded graciously and quickly, and Talarico entered the general election as the Democratic nominee against whoever emerged from the Republican runoff.

The Republican contest was, from its first weeks, a story about Donald Trump's absence from it. Cornyn, Paxton, and U.S. Representative Wesley Hunt all competed fiercely for the former and current president's endorsement throughout the primary period, and all three were denied it. Trump described both Cornyn and Paxton in private terms that were characterised by people with knowledge of the conversations as favourable toward Paxton but not definitive, and his public silence was interpreted variously as strategic neutrality, distaste for the messiness of the three-way contest, or a deliberate hedge against committing to a race whose outcome remained genuinely uncertain. The absence of Trump's blessing in a primary where all three candidates were claiming his legacy was its own kind of story about the limits of MAGA branding when the man himself declines to adjudicate.

The March result sent Cornyn and Paxton to the runoff with the closest possible margin between them. Cornyn finished with 41.9 percent. Paxton received 40.8 percent. Hunt came in with 13.4 percent, his supporters now free agents in the runoff fight. Cornyn technically led by just over a point, and his campaign chose to convey the result's ambiguity by holding no election night party — instead delivering brief remarks to reporters in a small Austin hotel ballroom that the press corps outnumbered. "Judgement Day" was coming for Paxton, Cornyn said, framing the runoff as the moment when Republican voters would have to reckon with what they would actually be putting on a general election ballot. Paxton, at a raucous Dallas watch party, cast the result as the beginning of a people's uprising against a Washington incumbent who would try to buy the nomination with outside spending. "John Cornyn is going to try to steal the election with another $100 million going into this Senate race," Paxton said. "But here's what we proved tonight. While the money may be on his side, the people are on our side."

Those words were not metaphor. The money disparity in the Cornyn-Paxton race has been, from the beginning, one of its defining structural features. Cornyn and the super PAC network supporting him had raised and spent at a scale that made the race, according to multiple reports as election day approached, the most expensive Senate primary in American history, at more than $165 million in combined spending across the candidates, their campaigns, and the outside groups operating on their behalf. The Lone Star Freedom Project, a super PAC chaired by former Governor Rick Perry, spent $18 million on Cornyn's behalf. Senate leadership PACs aligned with Thune and Mitch McConnell's orbit poured tens of millions more into advertising, direct mail, and phone banking operations designed to define Paxton's record and discredit him with the Republican primary electorate before they could cast their runoff ballots.

Paxton's record provides ample material for that effort. He is the first Texas attorney general to be impeached by the state legislature, impeached in 2023 by a Republican-controlled Texas House that found sufficient evidence of bribery, abuse of office, and obstruction of a federal investigation into a campaign donor who had received preferential treatment from the AG's office. He was acquitted in the subsequent Senate trial — also controlled by Republicans, with his wife Angela serving as a Texas state senator who voted in the trial — in a proceeding whose outcome was immediately questioned by advocates who noted that several Republican senators were seen as deferential to political considerations rather than the evidence. His wife subsequently divorced him, with court filings citing "biblical grounds" that included accusations of adultery — a characterisation that referenced, but did not fully specify, the allegations of an extramarital affair that had been circulating in Texas political circles for years and that Cornyn's campaign made the centrepiece of its advertising message. The phrase "What else happened inside Ken Paxton's office?" became the tagline of one of Cornyn's most-aired attack ads, and the message drove enough of the contrast argument that even in the March primary, Cornyn's massive spending advantage produced a result that kept him numerically ahead.

The strategic argument Cornyn has made, relentlessly and with increasing desperation as polling in the runoff showed him trailing, is an electability argument directed not at ordinary Republican voters but at the subset of Republican primary voters who care enough about winning the Senate in November to vote against their ideological preferences. Cornyn led Paxton in the March primary despite spending advantages that should have produced a more comfortable margin. Paxton led in most post-March runoff polling. The arithmetic of that gap represents the fundamental problem Cornyn has been unable to solve: a primary electorate that knows Paxton's record and has absorbed months of Cornyn advertising about it, but that prefers the fighter to the institutionalist regardless.

"We will have an Election Day massacre," Cornyn told a campaign event last month in Austin. "If Ken Paxton is at the top of the ticket, we risk losing the Senate seat, losing the majority in the House of Representatives, and it will take a toll on everybody on the ballot." The phrase "Election Day massacre" was simultaneously an honest political prediction and a strategic blunder — the kind of alarmist language that energises the base of the candidate being warned against rather than the candidate doing the warning. Paxton's team clipped it and used it in fundraising appeals within hours.

The Trump endorsement that arrived last week — just one week before the runoff, after months of absence — changed the race's dynamics in ways that the remaining polling was not fully able to capture before election day. Trump's endorsement of Paxton was delivered with his characteristic directness, calling Paxton a "GREAT" attorney general who had fought the Biden administration harder than any other state official in the country, and framing the endorsement as a recognition of Paxton's loyalty to the MAGA agenda. The endorsement arrived after a rally at which Paxton received it publicly, generating the specific kind of energy — the direct presidential affirmation, the crowd's response, the visual of Trump choosing one Republican over another — that has, in race after race across six years of post-2020 Republican primaries, been sufficient to move numbers by several points in the week remaining before the vote.

Cornyn's response to the endorsement told the story of his campaign's strategic options in the final week. He continued to campaign, held a final event in Corpus Christi on Friday where he predicted he would prove his doubters wrong, and told supporters "Texans get to choose our senator and no one else" — a statement of Texan independence from the endorsement that was also a statement of how much of the race he was prepared to run on without Trump's help. He refused to join Paxton's campaign and the Texas GOP chairman's request that both sides stop negative advertising and begin uniting for November. Cornyn ran ads through the weekend. He was, in his own framing, fighting until the last poll closed.

Paxton's campaign, by contrast, was already in general election mode before election day. His super PAC and campaign stopped running negative ads about Cornyn last week after the Texas Republican Party chairman asked both sides to shift toward unity messaging. The shift was a strategic confidence signal — a campaign that believes it is winning does not need to sharpen its attacks in the final days, it needs to consolidate its base and begin the pivot toward November. The implicit message to Republican voters was that the runoff was already settled and the only question was how long Cornyn would insist on prolonging a fight whose outcome had been determined by Trump's endorsement.

The race Paxton would enter in November — against Talarico, in a Texas that has not elected a Democrat to the Senate since Lloyd Bentsen in 1988 — is still rated Likely Republican by Cook Political Report, Inside Elections, and Sabato's Crystal Ball, a consensus that reflects the state's structural lean of approximately 10 to 15 points toward Republicans in statewide elections. But the asterisk on that consensus is real and explicitly stated: most if not all of the race-rating services note that a Paxton nomination makes the race closer than a Cornyn nomination would, and head-to-head polling before the runoff showed Talarico within approximately four points of Paxton — a spread that, in any state with genuine electoral competitiveness, would be described as a tossup rather than a safe Republican hold. Texas has not yet reached that threshold of competitiveness in recent statewide elections. Whether Paxton's record — the impeachment, the divorce, the federal investigation of his ally, the ethics violations — provides enough material for Talarico to change the state's fundamental partisan lean is one of the defining questions of the 2026 midterm cycle.

James Talarico will spend the weeks after the runoff doing two things simultaneously: watching the Republican primary produce its result and raising money. His campaign's fundraising since the March primary has been described by observers as exceptional — his profile, his performance against Crockett, and the national attention on the race have made him one of the most sought-after investment vehicles in Democratic Senate fundraising, and the combination of Talarico's skills as a candidate and whatever general election vulnerabilities emerge from the Republican runoff fight will together shape how much national money the DSCC and its allied groups choose to invest in a state they have been reluctant to fund at the scale that genuine competitiveness requires.

The other races on tonight's runoff ballot complete a picture of a Republican Party making choices about its own future at every level of the ticket. The Republican attorney general primary runoff fills the seat that Paxton is vacating — itself a race with multiple candidates carrying different factions' endorsements. Democratic House runoffs in Dallas and Houston districts settle nominations in seats that both parties understand are safe Democratic territory in November. A competitive San Antonio-area House seat runoff on the Democratic side features a contest over who will carry the party's banner in what is described as one of the district's most genuinely competitive general election environments.

Harris County — which encompasses Houston and is the most populous county in Texas — reported 145,000 early ballots cast in the runoff, with Republicans outpacing Democrats in early vote returns, a pattern consistent with the party's structural enthusiasm advantage in Republican-leaning runoffs where the marquee race is a competitive Republican primary rather than a competitive general election contest. The turnout picture will fill in over the course of the evening as precincts report across the state's 254 counties, a count that will extend well past any deadline this article was written to anticipate.

What is already certain is what tonight has produced regardless of the result: a Republican Party that went into its most expensive primary in history divided about what winning actually means, with one faction arguing that winning means sending the most electable candidate to a general election that the party should be able to win with its eyes closed, and another faction arguing that winning means sending the most ideologically committed fighter regardless of the baggage attached, because the fight matters more than the margin. It is an argument the Republican Party has been having with itself since 2022, when candidates backed by that second faction underperformed in general elections across the country and cost the party a Senate majority it was positioned to win. Tonight, Texas voters settled the argument for their state. The full consequences of that settlement will not be visible until November 3.

Sources

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