Senator Bill Cassidy's political survival hangs in the balance this Saturday in Louisiana, where a single procedural change has tilted the playing field sharply against him and exposed a broader vulnerability that has already claimed most Republicans who dared to vote against Donald Trump.
Cassidy, one of seven Senate Republicans who voted to convict Trump during the January 2021 impeachment trial, faces two formidable challengers in the GOP primary: Representative Julia Letlow, backed by Trump himself, and state Treasurer John Fleming, a former congressman running on a Trump-friendly platform. Polls show the race remarkably tight, setting up the possibility of a June runoff if no candidate claims an outright majority Saturday night.
What makes this contest particularly treacherous for Cassidy is Louisiana's shift from an open primary system to a closed one. The change means only registered Republicans can cast ballots, effectively removing the moderate Democrats and independents who might sympathize with his impeachment vote. Instead, Cassidy must appeal exclusively to party loyalists for whom Trump's influence runs deepest and where his vote to convict carries the weight of betrayal.
The data tells a stark story. Among the seventeen Republicans in Congress who voted to impeach or convict Trump over the Capitol riot, only three survived subsequent elections: Representatives Dan Newhouse and David Valadao, both of whom competed in California and Washington's open primaries that drew candidates from both parties, and Senator Lisa Murkowski of Alaska, who won through a similar all-voter system in 2022. The rest either lost or declined to run again when facing Republican-only primaries.
Cassidy has invested heavily in attacking Letlow, a strategy that may inadvertently have benefited Fleming by fracturing the anti-Trump vote. Even if Cassidy scrapes into a June runoff, observers widely view his chances in that contest as grim. The closed primary architecture means his path to victory has narrowed to nearly nothing.
There is one notable exception to this grim pattern: Senator Susan Collins of Maine, who faces re-election this year without a Trump-backed primary challenger. Maine's primary rules technically permit independents to vote, but the broader reality is that Trump apparently calculated Collins poses his best bet for holding the seat in a blue-leaning state. Louisiana presents no such calculation. Trump and his allies see an opportunity to eliminate one of their remaining Senate nemeses, and they are moving aggressively to seize it.
The Cassidy race reflects a broader realignment in the Republican Party, one in which loyalty to Trump has become the dominant litmus test and where procedural rules governing primaries can determine survival or defeat for those who challenged the former president.
Author Sarah Mitchell: "Cassidy's probable defeat would represent not just a personal reckoning but a consolidation of Trump's grip on the Senate Republican caucus that will reshape how members calculate their votes on the most divisive questions."
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