Fleming Hits 29% in Senate Market Despite Trump Backing His Rival

John Fleming entered the Louisiana Republican Senate primary with every institutional force in the state lined up against him. President Donald Trump endorsed his rival, Rep. Julia Letlow. Governor Jeff Landry publicly questioned whether Fleming is "fit for office". Incumbent Sen. Bill Cassidy's campaign reported $10.1 million in cash on hand as of December 31, 2025, dwarfing Fleming's $2.1 million. The message from Louisiana's Republican power structure could not be clearer: not this guy.

Prediction markets disagree. Fleming's implied probability of winning the Republican nomination has surged to 29% on Kalshi and PredictIt, up 14 percentage points in just three days. His period low sat at 13%. The market now prices the state treasurer as a serious contender in a race that resolves on April 18, despite the full weight of establishment opposition.

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Louisiana's Republican Establishment Is Pulling Every Lever Against John Fleming

The opposition campaign against Fleming has been public and personal. In February, after Fleming accused Landry of spending over a year orchestrating Trump's endorsement of Letlow, the governor fired back directly. "Anyone who makes" such claims, Landry said, "may not be fit for office," according to KNOE. The attack was notable for its specificity: a sitting Republican governor publicly kneecapping a fellow Republican's Senate bid. Fleming didn't back down, telling reporters that Landry had "rearranged the chairs on the deck" to clear his own future path to the Senate.

The financial gap reinforces the institutional disadvantage. Cassidy has raised $11.7 million total and spent only $3.3 million, leaving a massive war chest for the final stretch. Fleming has raised $8.7 million but spent $6.6 million, leaving him outgunned nearly five-to-one in available cash, per FEC filings. Letlow trails both in total fundraising at $2 million raised but carries the trump card of the presidential endorsement.

Yet none of this has stopped Fleming's price from climbing. Bettors are pricing through the headwinds, not ignoring them.

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The Prediction Market Signal: Why John Fleming's Jump to 29% Demands Attention

A 14-point move in 72 hours is not noise. On Kalshi, Fleming currently trades at 32%. On PredictIt, he sits at 26%. The six-point spread between platforms reflects different trader demographics and fee structures, but both markets are moving in the same direction with conviction.

The most plausible catalyst is an April 2026 poll showing Letlow at 29.0%, Fleming at 23.5%, Cassidy at 19.7%, and a massive 26.8% undecided. That undecided block is the story. In a three-way race where no candidate clears 30% and more than a quarter of likely voters haven't committed, the race is genuinely open. Fleming's 23.5% is statistically within striking distance of Letlow's 29.0%, especially given standard margins of error.

This poll also revealed something the establishment would prefer to ignore: Cassidy, the incumbent senator with the largest war chest in the race, is running third. The market appears to be processing Cassidy's weakness as Fleming's opportunity.

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The Polling Tightness No One in Baton Rouge Wants to Talk About

Fleming's case rests on consistent polling strength that predates the April survey. A February JMC Analytics poll of 645 likely Republican primary voters showed Fleming at 26%, Letlow at 25%, and Cassidy at 22%, with 27% undecided, according to Louisiana Radio Network. A separate February poll by Quantus Insights, with a larger sample of 1,428 likely Republican voters, put Fleming ahead at 34%, with Letlow at 25% and Cassidy at 20%, per 270toWin.

The head-to-head matchups are even more revealing. In the JMC poll, Fleming led Cassidy 48% to 28% and led Letlow 40% to 31%. These aren't margins that suggest a fringe candidate propped up by name recognition. They suggest a candidate who consolidates conservative support when the field narrows.

Fleming's electoral biography matters here. He represented Louisiana's 4th Congressional District from 2009 to 2017 and ran for Senate in 2016, giving him deep name identification across northern Louisiana. His current role as state treasurer provides statewide visibility without the Washington baggage that Cassidy carries, particularly after Cassidy's vote to convict Trump during the second impeachment trial. In a Republican primary where Trump's approval is paramount, that vote remains a vulnerability for Cassidy that no amount of cash on hand can erase.

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The Bear Case: Why 29% Could Still Be Too High

The strongest argument against Fleming is simple: Trump endorsed Letlow. In Republican primaries since 2016, Trump's endorsement has functioned as a near-dispositive signal for a plurality of voters. If undecided voters break toward Letlow on the basis of that endorsement alone, Fleming's polling strength evaporates quickly. Letlow also carries the institutional advantage of a sitting congressional seat, which provides media access, constituent services infrastructure, and the ability to claim legislative accomplishments.

There's a financial reality to confront as well. Fleming has already burned through $6.6 million of his $8.7 million raised. Running a statewide media campaign in Louisiana's final week with roughly $2 million is possible but constraining. Cassidy, should he consolidate establishment support behind himself or choose to spend aggressively against Fleming, has the resources to flood the airwaves. And the 26.8% undecided block could just as easily break for Letlow or Cassidy as for Fleming.

The April poll from The Hayride itself acknowledged the uncertainty in its headline: "Do We Have Any Better Read On Who's Going To Win The LA Senate Race? (Not Really)." At 29% implied probability, the market is not calling Fleming the favorite. It is calling him a live contender in a fractured field. That distinction matters.

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What 29% Actually Means With Seven Days to Resolution

At 29%, bettors are saying Fleming wins roughly three out of every ten times this race plays out. That's not a prediction of victory. It's a recognition that the three-way split, the massive undecided pool, and Cassidy's underperformance create a scenario where Fleming can win without ever leading a single pre-election poll outright.

The market resolves April 18. Between now and then, any internal polling leak, endorsement shift, or debate moment could move the price materially in either direction. The Kalshi-PredictIt spread of 32% to 26% suggests some disagreement about how to weight the Trump endorsement factor.

What the market is pricing, above all, is optionality. Fleming has survived a governor's public rebuke, a presidential endorsement of his opponent, and a five-to-one cash disadvantage. He's still standing at 23.5% in the polls with a week to go. For bettors, that resilience is worth a 29% implied probability.