Texas Senate runoff tests Trump's grip in Cornyn-Paxton race

John Cornyn and Ken Paxton spent the final day before Texas’s Republican Senate runoff flooding television and digital ad markets. The blitz has turned Tuesday’s vote into a test of Donald Trump’s sway over a sitting Republican senator and of whether electability still carries weight with GOP voters.

Cornyn led the March primary with 42 per cent. Paxton was just behind on nearly 41 per cent, The Hill reported, and the close finish pulled the race into the national spotlight. More than $109 million in combined television and digital spending has since poured into the runoff. That has turned a Texas primary into a national proxy fight over loyalty, ideology and who gives Republicans their best chance in November. Cornyn has pitched himself as the better general-election candidate, leaning on his statewide record, donor network and Senate experience. Paxton has answered with a simpler message: closeness to Trump matters more than seniority.

Trump made that divide explicit when he endorsed Paxton and called Cornyn “VERY disloyal to me”. Paxton has built his closing case around that endorsement. Cornyn, a former Senate whip, has kept returning to electability and to the argument that Republicans need a nominee who can withstand a hard November fight.

The spending gap has not put the race away. AP said Cornyn’s campaign and allied super PACs held an almost nine-to-one advantage over Paxton-friendly groups over the past year, yet the runoff still tightened in its final days. Wayne Hamilton, a former chair of the Texas Republican Party, summed up the finish this way: “It’s just a slug fest, with the campaigns and third-party groups slugging it out.”

Why the race matters

A Paxton victory would tell Republicans that Trump’s backing is still enough to endanger even a well-funded incumbent with deep establishment support. If Cornyn survives, the lesson is narrower but still important. It would mean at least some GOP voters are willing to choose organisation, money and general-election arguments over a direct appeal to Trump’s loyalty politics. Neither result would end the argument inside the party, but it would give operatives another measure of how much Trump’s endorsement still settles a close race.

Cornyn has tried to make that case without openly taking on the president. Asked about Trump’s attacks, he told AP that “Texans are a pretty independent breed and people will be making their own choices”. That is Cornyn’s closing argument: Texas Republicans will choose the nominee, and they can still weigh campaign strength against presidential pressure.

Paxton has framed it differently. He has tied Cornyn’s long Washington career to the Republican establishment that many activists want to push aside. His bet is that grassroots voters care more about alignment with Trump than about Cornyn’s years in Senate leadership.

Polls open Tuesday in a state with 18.7 million registered voters, according to AP’s account of the race, but the campaigns are chasing the much smaller share of Republicans who usually show up for a runoff. By Tuesday night, Republicans in Washington will be parsing more than the margin. They will be asking which argument moved voters at the end and whether Trump’s endorsement still settles the party’s hardest internal fights.