Donald Trump's endorsement proved brutally effective in May primaries, as Republicans who defied him learned a costly lesson about crossing the party's dominant force. Of the 10 candidates Trump backed against sitting GOP lawmakers, all but two secured victories, cementing his control over the Republican apparatus and signaling that party loyalty now flows through Mar-a-Lago.
The scale of Trump's influence became immediately obvious in Louisiana, where GOP Sen. Bill Cassidy, one of seven senators who voted to convict Trump on impeachment charges after January 6, finished with just 25 percent in his primary. Trump's candidate, Rep. Julia Letlow, claimed 45 percent of the vote and advanced to a June runoff. Cassidy's loss marked the first electoral test for any sitting Republican who voted to impeach Trump, and he did not recover.
In Kentucky, Rep. Thomas Massie became Trump's most publicized scalp. Massie, a persistent congressional critic who had opposed Trump's spending and foreign policy moves, lost by a decisive 55-45 margin to Trump-backed Navy veteran Ed Gallrein. The race became the most expensive House primary in American history, with over $33 million in ads flooding the airwaves, much of it targeting Massie from outside groups aligned with Trump.
Massie tried to salvage his defeat by noting that 45 percent of GOP voters had stood by him despite the deluge of opposition spending. "That means 45 percent of the party still believe in the ideals that I believe in and have espoused in Washington, D.C.," he told NBC News. But the larger message was unmistakable: Trump's allies can overwhelm even veteran lawmakers with resources and momentum.
Indiana delivered another string of Trump victories. He backed seven challengers against state GOP senators who had blocked a redistricting push that would have boosted Republican congressional seats in the midterms. Five of those Trump-backed challengers won. One race between state Sen. Spencer Deery and Paula Copenhaver remained so tight it triggered a recount, separated by just three votes. Only one Trump opponent, state Sen. Greg Goode, survived his primary challenge.
State Sen. Greg Walker, who lost to Trump-endorsed state Rep. Michelle Davis, acknowledged the message sent by voters. "I have to ask folks that voted here in District 41 or anyone in the nation, do you think that Indiana serves better when we're under coercion and threat?" he said on NBC News. "Clearly on the national level, it has been a backfire."
Trump's final move came in Texas, where he threw his weight behind state Attorney General Ken Paxton in the Republican Senate primary runoff against longtime Sen. John Cornyn. Paxton, who faced impeachment on corruption charges before acquittal and whose wife filed for divorce, had been trailing expectations before Trump weighed in. The endorsement proved decisive. Paxton crushed Cornyn 64-36 in the runoff, a result Texas Republicans attributed directly to Trump's influence.
"Clearly the president has an impact on the base that has not been seen in our lifetime," said George Seay, a longtime Cornyn friend and donor. Seay suggested Trump's last-minute endorsement transformed what would have been a close contest into a landslide.
Trump's May primary blitz demonstrated something Republicans have slowly accepted over the past four years: crossing him carries electoral consequences that party seniority and institutional advantage cannot overcome. Millions in outside spending, endorsement power, and a mobilized base behind Trump proved sufficient to take down sitting lawmakers in races they should have dominated. The handful of Republicans still in Congress who voted to impeach Trump now face the practical reality of what defiance costs in the age of Trump dominance.
Author Sarah Mitchell: "Trump's May victories weren't surprises so much as confirmations that he's weaponized the Republican base into an enforcement mechanism against dissent."
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