News

Bill Cassidy Louisiana Primary Loss: Letlow vs. Fleming Runoff Dates

Mohammed Saad 2 days ago

0 7 6 minutes read

Bill Cassidy Loses Louisiana Primary: Letlow vs. Fleming Runoff Dates

Two-term incumbent Senator Bill Cassidy finished third in the Louisiana Republican primary on May 16. His defeat marks a sharp turn in the state’s political direction, driven by a new closed primary system and strong pushback from the party’s conservative base. With no candidate reaching the 50% threshold, voters will return to the polls on June 27 to decide the runoff between Representative Julia Letlow and State Treasurer John Fleming.

Incumbent Senator Bill Cassidy lost the Louisiana Republican primary on May 16, 2026, finishing third with 24.4% of the vote. Representative Julia Letlow (45.2%) and State Treasurer John Fleming (28.3%) will advance to a primary runoff on June 27 because no candidate reached the 50% threshold to win outright.

Key Takeaway

Senator Bill Cassidy was eliminated from the race after securing only 24.4% of the vote.
Representative Julia Letlow placed first with 45.2%, followed by State Treasurer John Fleming at 28.3%.
Letlow and Fleming will compete in a Republican primary runoff scheduled for June 27, 2026.
This is Louisiana’s first closed partisan primary for congressional races since 2010.
In-person voter registration for the upcoming runoff closes on May 27.

Quick Answer: When is the Runoff?

If you plan to vote in the June 27 Republican runoff, follow these three steps:

Check your party affiliation: You must be registered as a Republican to vote in the Letlow vs. Fleming runoff.
Meet the registration deadlines: The deadline to register in person or by mail is May 27. The online registration portal closes on June 6. [Louisiana Secretary of State Voter Registration]
Vote early or on Election Day: The early voting period runs from June 12 to June 20, excluding Sunday and the Juneteenth holiday. Runoff Election Day is June 27.

Common mistake: Assuming the old voting rules apply. Because Louisiana transitioned to a closed party primary for this Senate race, cross-party voting is no longer allowed. You must be a registered Republican to participate.

Why Bill Cassidy Lost the Republican Primary

The Impact of the 2021 Impeachment Vote

Cassidy’s path to a third term collapsed after his 2021 vote to convict Donald Trump during the former president’s second impeachment trial. That single vote caused severe backlash among conservative voters in Louisiana.

Trump actively campaigned to unseat the incumbent senator. He officially endorsed Representative Julia Letlow in January 2026, cementing her status as the conservative base’s preferred candidate.

Following the primary results, Trump posted a sharp response on Truth Social: “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!”

Cassidy stood by his voting record during his concession speech. Addressing his supporters, he stated: “Our country is not about one individual… It is about the welfare of all Americans, and it is about our Constitution.”

How the New Closed Primary System (HB 17) Changed the Math

Louisiana recently changed how it runs congressional elections. Under Louisiana House Bill 17, the state eliminated its famous open “jungle primary.” The old system placed all candidates, regardless of party, on the same ballot.

This 2026 election marks the first time since 2010 that Louisiana has used a closed partisan primary.

Mini Case Study: When a state shifts from an open jungle primary to a closed partisan primary, it drastically alters the path to victory for moderate incumbents. Under the old system, a candidate like Cassidy could have relied on crossover votes from moderate Democrats to offset losses in the Republican base. By closing the primary, that mathematical path vanished.

The Letlow vs. Fleming Runoff Matchup

The June 27 runoff will decide the Republican nominee, who will then advance to the general election on November 3, 2026. Both advancing candidates currently hold public office, but they took different paths to the runoff.

Candidate	Current Office	Primary Vote Share	Campaign Funds Raised
Julia Letlow	U.S. Representative (LA-05)	45.2%	$4.3 Million
John Fleming	Louisiana State Treasurer	28.3%	$11.2 Million

Campaign spending did not dictate the winner in this primary round. For example, Cassidy raised over $13 million—a massive financial advantage—but still lost to Letlow, who raised around $4.3 million. Letlow leveraged her high-profile national endorsement to secure the top spot without matching the incumbent’s spending limit.

Celebrating her first-place finish, Letlow made it clear what drove her campaign’s momentum. “There is no greater endorsement than the endorsement of President Trump,” she told supporters. “We’ll always be singing that from the mountaintops.”

Louisiana Voter Guide: June 27 Runoff Deadlines

Important Deadlines for Voters

The state’s shift away from the traditional jungle primary requires voters to meet new scheduling requirements. To vote in the upcoming Republican runoff election, you must be a registered Republican and complete your paperwork within the windows set by the Louisiana Secretary of State.

The essential timeline below details every critical deadline for the June vote:

May 27, 2026: Deadline to register to vote in person or by mail.
June 6, 2026: Deadline to register to vote online. [Louisiana Secretary of State Voter Registration]
June 12 – June 20, 2026 (Excluding Sunday and holidays): Early voting window for the primary runoff.
June 23, 2026: Deadline to request an absentee ballot from your parish registrar.
June 26, 2026: Deadline for your registrar to receive your voted absentee ballot.
June 27, 2026: Primary Runoff Election Day. Polls are open from 7:00 AM to 8:00 PM.

Pro Tip: Do not wait until the final week to review your status. If you are registered as an Independent or unaffiliated voter, you cannot vote in this specific race under the closed primary rules.

Race Summary

The Outcome: Two-term incumbent Bill Cassidy finished third with 24.4% of the vote and was eliminated.

The Contenders: Julia Letlow (45.2%) and John Fleming (28.3%) advance to the next round.

The Cause: High-profile national endorsements and a move to a closed voting system shifted voter math.

The Next Step: Registered Republicans will select the final nominee during the June 27 runoff.

Conclusion

The 2026 Louisiana Republican primary proved how quickly election structural changes can alter political outcomes. By eliminating the open primary format, the state fundamentally reshaped how candidates compete for office. Incumbent Senator Bill Cassidy’s elimination highlights the clear power of national party endorsements and ideological alignment within a closed primary pool.

If you are a registered Republican voter in Louisiana, prepare for the next voting phase by completing these three steps:

Confirm your registration details on the official state portal before May 27.
Locate your early voting site if you plan to cast your ballot between June 12 and June 20.
Review the platform differences between Julia Letlow and John Fleming ahead of the June 27 election.

FAQs

Why is there a runoff for the Louisiana Senate race?

Under Louisiana law, a candidate must win over 50% of the vote to secure the party nomination outright. Because first-place finisher Julia Letlow earned 45.2%, the top two candidates must compete in a head-to-head runoff.

When is the Louisiana Republican Senate runoff?

The primary runoff election is scheduled for Saturday, June 27, 2026. Polls across the state will open at 7:00 AM and close at 8:00 PM.

Can Democrats or Independents vote in the June 27 primary runoff?

No. Louisiana currently uses a closed primary system for congressional races. Only voters registered as Republicans can participate in this Republican primary runoff.

Who endorsed Julia Letlow?

Former President Donald Trump officially endorsed Representative Julia Letlow in January 2026 and campaigned in favor of her candidacy throughout the primary cycle.

What happened to Bill Cassidy?

Senator Bill Cassidy finished third in the primary with 24.4% of the vote. As a result, he was eliminated from the race and will not appear on the June runoff ballot.

When is the 2026 general election for Louisiana Senate?

The winner of the June 27 Republican runoff will advance to the general election ballot on November 3, 2026, to face the nominees chosen by other parties.

What is Louisiana House Bill 17?

Louisiana House Bill 17 is the legislation passed in 2024 that eliminated the state’s open jungle primary for congressional elections, replacing it with a traditional closed partisan primary system starting in 2026.