Texas Republican Senate nominee?

Donald Trump has not yet endorsed a candidate in the Texas Senate runoff. The runoff, scheduled for May 26, 2026, involves John Cornyn and Ken Paxton. Trump announced on Truth Social on March 4, 2026, that an endorsement would be made 'soon,' and he urged the non-endorsed candidate to withdraw ^{[^]}. As no endorsement has been issued, there are currently no reported specific actions he will take to support a candidate, such as holding rallies in Texas, sending dedicated fundraising emails, or directing PAC ad spending.

Historical data does not show Trump's endorsements shifting votes significantly. There is no polling evidence from Texas indicating that Trump's endorsement has historically shifted more than 5% of the vote in a statewide primary runoff [Web Research Results]. Recent hypothetical polls from March 2026 suggest that a Trump endorsement could shift votes by 1-3 points in the current runoff ^{[^]}. For example, one poll indicated a candidate's support potentially changing from 49% to 44%, or from 42% to 41% with a hypothetical endorsement ^{[^]}.

Senator John Cornyn's campaign heavily outspent Ken Paxton's in ad spending. In the 60 days leading up to the runoff, Cornyn's campaign and allied Super PACs, including Texans for a Conservative Majority, Lone Star Freedom Project, NRSC, and One Nation, collectively invested approximately $70 million on TV and digital advertisements ^{[^]}. This substantial spending primarily targeted major media markets across Texas, with some additional advertising purchases made out-of-state ^{[^]}. In stark contrast, Ken Paxton's allied Lone Star Liberty PAC spent roughly $4 million, establishing an approximate 17:1 disparity in advertising expenditure ^{[^]}.

Campaigns deployed contrasting narratives, utilizing AI in their advertisements. Paxton's ad campaigns consistently branded Cornyn as a "Trump betrayer" and a "RINO" (Republican In Name Only), frequently incorporating AI-generated content to convey this message ^{[^]}. Conversely, Cornyn's advertisements aimed to characterize Paxton as "corrupt" and "unelectable," highlighting his past legal challenges and alleged personal scandals through various AI-parody and scandal-focused ads ^{[^]}.

Despite financial disparities, Paxton's narrative resonated more with voters. Even with the significant financial advantage held by the Cornyn campaign and its allies, Paxton's preferred narrative appears to have been more effective ^{[^]}. Paxton successfully compelled the race into a runoff and showed a lead in pre-runoff polls, which suggests a strong appeal of his "conservative fighter" versus "RINO" framing among the Republican base, despite his substantially lower spending ^{[^]}.

Wesley Hunt's primary vote share concentrated heavily in the Houston metropolitan area [^] . Hunt secured 13-13.5% of the vote in the March 3 primary, with a significant concentration in the Houston metropolitan area, including approximately 20% in Harris County and 22% in Texas's 38th Congressional District (TX-38) [Web Research Results] ^{[^]}. While he placed third statewide, Hunt's support surpassed the statewide average in 68 counties, which collectively represent 46.5% of the Republican electorate [Web Research Results] ^{[^]}. These 'high-Hunt' counties largely aligned with areas where Paxton performed well, with Paxton receiving 41.6% of the vote compared to Cornyn's 39.0% [Web Research Results] ^{[^]}. Conversely, Cornyn maintained a lead in the 186 'low-Hunt' counties, securing 44.4% of the vote against Paxton's 39.9% [Web Research Results] ^{[^]}. Senator Cornyn's campaign demonstrates a more extensive and organized ground game ^{[^]}. Cornyn's campaign has initiated statewide volunteer signup efforts for various activities, including door-knocking, calls, and events across all 254 Texas counties [5, 6, 7, Web Research Results] ^{[^]}. This comprehensive effort is supported by significant campaigning, numerous events, and substantial ad spending exceeding $70 million [5, 6, 7, Web Research Results] ^{[^]}. In contrast, Paxton's campaign strategy predominantly focused on rallies and engagement through social media, showing a less visible field presence [Web Research Results] ^{[^]}. This strategic difference suggests Cornyn's campaign achieved a broader statewide reach and benefited from greater financial investment compared to Paxton's approach [5, 6, 7, Web Research Results] ^{[^]}.

Public data suggests Paxton maintains strong base support despite attacks. While direct private polling or focus group data indicating a 'rally-around-the-flag' effect among Ken Paxton's base due to his legal battles, specifically increasing motivation for a low-turnout runoff, has not been identified, public information suggests strong underlying support for him. Despite approximately $16.67 million spent on anti-Paxton advertisements, he has maintained significant backing ^{[^]}. Pro-Paxton memos further highlight a +51 net favorability among strong Republicans, indicating a resilient base not easily swayed by negative campaigning ^{[^]}.

Paxton's base remains resilient, viewing attacks as validation. This sustained support suggests that negative campaigning has not significantly eroded Paxton's core base, a phenomenon observed with other political figures. Paxton himself has characterized these attacks as evidence of his effectiveness ^{[^]}. Runoff elections typically favor candidates who can mobilize a highly committed base, a characteristic often attributed to Paxton's conservative supporters in lower-turnout contests. In the prediction market for the 2026 Texas Republican Senate nominee, Ken Paxton currently holds a 40% chance of winning, while John Cornyn is at 61% ^{[^]}.

Prominent Texas Republicans remain uncommitted in the U.S. Senate runoff. As of March 25, 2026, figures like Governor Greg Abbott and Lt. Gov. Dan Patrick, who maintained neutrality in the initial primary round, have not formally endorsed either John Cornyn or Ken Paxton in the runoff [Web Research Results]. Senator Ted Cruz also explicitly confirmed his continued neutrality in the Cornyn-Paxton runoff [Web Research Results, 8]. Although Ken Paxton has garnered endorsements from new slates of grassroots leaders, these do not include Abbott or Patrick ^{[^]}.

The NRSC has actively supported Cornyn while expressing Paxton concerns. The National Republican Senatorial Committee (NRSC) has taken a decisive stance in the runoff by endorsing John Cornyn [Web Research Results]. The committee publicly released internal polling data indicating concerns about Ken Paxton's general election viability, which showed Paxton trailing a hypothetical Democratic challenger like Talarico by three points (Talarico +3) [Web Research Results, 6]. The NRSC has also significantly invested, spending approximately $70 million to support Cornyn in the primary [Web Research Results]. These actions collectively signal the NRSC's serious concerns regarding Paxton's electability as the potential nominee; however, the committee has not explicitly threatened to withhold general election funds if Paxton wins the primary runoff [Web Research Results].

A significant catalyst for the Republican nomination will be the imminent endorsement from former President Trump, who indicated he will support one candidate and call for the other to drop out [^] . Incumbent John Cornyn benefits from substantial establishment funding, having spent over $70 million in the primary, and is generally perceived as more electable in the general election ^{[^]}. Conversely, Ken Paxton garners strong support from the MAGA base and shows a slight lead in some runoff polls ^{[^]}.

The outcome of the May 26, 2026 runoff election itself is a critical catalyst, as runoff turnout often favors more conservative voters, potentially boosting Paxton's chances [^] . Furthermore, a highly contentious intra-party battle could weaken the eventual Republican nominee, making them more vulnerable against Democrat James Talarico in the November 2026 general election, where Talarico already polls around 45-46% ^{[^]}.