Louisiana Republicans settled a long-running fight over a senator who broke with the party’s base, sending Sen. Bill Cassidy to a distant third and setting up a runoff between Trump-backed Rep. Julia Letlow and former Treasurer John Fleming. Voters punished a senator whose 2021 impeachment vote and later moves put him at odds with President Trump and the state GOP. With the primary behind them, conservatives in the state now head into a runoff that could reshape the Senate map this fall.
Primary night in Louisiana made one thing plain: party loyalty matters. Rep. Julia Letlow led the field and John Fleming followed, leaving Cassidy trailing well behind. Louisiana Republicans moved decisively toward candidates aligned with President Trump.
Letlow captured the plurality of votes and will advance to a June 27 runoff against Fleming. She framed the result as a mandate for conservative, pro-Trump leadership, and celebrated the outcome publicly to X on Saturday night. Fleming also issued a victory message early Sunday, vowing to “win this election for the people of Louisiana,” and he signaled he’ll press forward .
Cassidy finished third with roughly a quarter of the vote, a striking fall for an incumbent. His loss reflects a broader shift in Republican politics since 2021, when a few GOP senators broke from the base over the impeachment that followed January 6. That decision has trailed Cassidy through successive cycles.
“When you participate in democracy, sometimes it doesn’t turn out the way you want it to. But you don’t pout, you don’t whine, you don’t claim the election was stolen, you don’t find a reason, you don’t manufacture some excuse,” Cassidy said after the race was called. “You thank the voters for the privilege of representing the state or the country for as long as you’ve had that privilege, and that’s what I’m doing right now.”
Long before Tuesday, polling showed Cassidy in trouble. Surveys from groups like Quantas Insights, Emerson College, and American Pulse had him trailing both Letlow and Fleming for months. That steady pattern gave campaigns time to position themselves and energized voters opposed to Cassidy’s record.
https://x.com/jbletlow/status/2055846758861640132
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Cassidy’s awkward fit with the modern Republican coalition helps explain the result. He won a previous term riding a “Complete and Total Endorsement” from , but then joined six other Republicans in voting to convict the former president in February 2021. That move remains a defining moment in his political identity.
Politics in Louisiana has also changed structurally, and the rules matter. Gov. Jeff Landry, a firm Trump ally, signed legislation to implement closed primaries beginning in 2026, a shift that narrows crossover voting and strengthens primary voters’ power. Republicans who once benefited from Democratic crossover in open primaries now face a more disciplined GOP electorate.
Cassidy’s past record included overtures that didn’t sit well with the party base. He once supported Democrats and even backed Michael Dukakis in 1988, and he has given to Democrats in years past. That history, combined with the impeachment vote, left many conservatives skeptical of his fidelity to the party.
The political landscape only hardened after the 2024 presidential result. President Trump returned to the White House and won Louisiana overwhelmingly, and his influence over GOP primaries strengthened. Candidates who aligned with Trump carried momentum into down-ballot contests across the state.
Trump never let Cassidy’s impeachment vote go unanswered. For over two years he has criticized Cassidy relentlessly on social platforms, calling him “wacky,” “incompetent,” “A TOTAL FLAKE,” and “a very disloyal person.” Those repeated attacks kept the issue in voters’ minds and framed Cassidy as out of step with conservative loyalty.
Late on primary night, Trump celebrated Cassidy’s defeat in blunt terms: “Bill Cassidy, after falsely using his ‘relationship’ with me during his political career, and winning Elections because of it, voted to impeach me on preposterous charges that were fake then, and now, are criminally insane! His disloyalty to the man who got him elected is now a part of legend, and it’s nice to see that his political career is OVER!”
Even after Trump’s return to the White House, Cassidy tried to repair fences. He cast a key vote to confirm Robert F. Kennedy Jr. as health and human services secretary, a move that drew both praise and criticism. That gesture proved insufficient to erase lingering doubts among primary voters.
Now the runoff between Letlow and Fleming will determine who carries the Republican torch into November. Each candidate will press their case to a conservative electorate that has been clear about what it wants: alignment with the president and a firm conservative approach. Whoever wins will face the victor of the Democratic runoff in the general election.
The result also signals to other GOP incumbents that breaking with the base carries consequences. Voters rewarded candidates who tied themselves to conservative priorities and the president’s vision, and they rejected an incumbent who strayed. That lesson will echo in races beyond Louisiana.
For conservatives watching closely, this primary was more than a state contest. It was a moment when grassroots energy and presidential influence intersected to change the trajectory of a Senate seat. The next weeks will test which message resonates most with Louisiana’s Republican voters as they head to the runoff.
