Sen. Bill Cassidy of Louisiana lost his Republican primary Saturday, ending a two-decade career in public office that was defined by his vote in 2021 to convict then-former President Donald Trump on impeachment charges of inciting the Jan. 6 Capitol attack.
Cassidy failed to advance past a crowded GOP primary field as Trump-backed Rep. Julia Letlow and state Treasurer John Fleming are projected to face each other in a June 27 runoff. The winner will be heavily favored in November in ruby-red Louisiana. Cassidy, who served six years in the House before winning his Senate seat in 2014, had just won re-election by a dominant margin weeks before his impeachment vote.
What the Left Is Saying
Senate Democrats pointed to Cassidy's defeat as evidence of Trump's grip on the Republican Party and the consequences for any member willing to hold the former president accountable.
"This is what loyalty to Trump costs you if you're a Republican," said Sen. John Fetterman, D-Pa., in a statement. "Cassidy voted his conscience, and Trump made him pay for it."
Progressive groups argued that Cassidy's loss illustrates how difficult it has become for any mainstream Republican to survive a primary without complete fealty to the former president.
"The price of dissent in today's GOP is your career," said Jesse Little, a spokesperson for the progressive group End Citizens United. "Cassidy proved that even voting with Trump nearly 95% of the time isn't enough if you cross him on just one issue."
Some Democrats noted that Cassidy's medical expertise and work on health care policy will be missed in the Senate, despite their policy disagreements.
What the Right Is Saying
Trump supporters celebrated Cassidy's defeat as another victory in the former president's ongoing campaign to remove Republicans deemed insufficiently loyal.
"This is what happens when you betray the president," said Rep. Marjorie Taylor Greene, R-Ga., on social media. "Cassidy chose woke Democrats over Louisiana Republicans, and they remembered."
Conservative commentators argued that Cassidy's impeachment vote violated a fundamental expectation of party loyalty that voters hold dear.
"Trump was right to target these senators," wrote conservative columnist Dan McLaughlin in a widely shared piece. "An impeachment conviction against a president from your own party is an extraordinary act. Louisiana Republicans were never going to forgive it."
Some Republican strategists noted that Cassidy's voting record aligned closely with Trump's agenda on most issues, making his defeat even more striking as a case study in the primacy of personal loyalty over policy agreement.
What the Numbers Show
Cassidy served 20 years in public office: six years in the Louisiana state Senate, six years in the U.S. House, and eight years in the Senate since winning election in 2014's red wave by defeating Democratic Sen. Mary Landrieu.
According to voting records compiled by FiveThirtyEight, Cassidy voted with Trump's position approximately 94% of the time during his Senate tenure. He rarely opposed Trump's legislative priorities, administrative nominees, or judicial appointments across both terms.
Only two of the six Republican senators who voted to convict Trump in the 2021 impeachment trial remain in office: Sen. Lisa Murkowski of Alaska and Sen. Susan Collins of Maine. Among House Republicans, only two of the 10 who voted to impeach Trump are still serving, with Rep. David Valadao of California being the sole incumbent running for re-election this cycle.
In his final Senate term, Cassidy chaired the Health, Education, Labor and Pensions Committee, overseeing the Department of Health and Human Services under Secretary Robert F. Kennedy Jr., a vaccine skeptic whose "Make America Healthy Again" agenda put him at odds with Cassidy's pro-vaccine positions as a physician.
The Bottom Line
Cassidy's defeat demonstrates that Trump maintains a stranglehold on Republican primaries, even when the incumbent has an otherwise heavily Trump-aligned voting record. His loss adds to a growing list of Republicans who faced primary challenges after crossing the former president on impeachment.
The outcome also signals continued tension within the GOP over health policy, as Cassidy's medical expertise and vaccine advocacy clashed with elements of Trump's current agenda. What happens in the June 27 runoff between Letlow and Fleming will determine who fills a seat that has been reliably Republican for decades.