In the Louisiana Republican primary for U.S. Senate held on May 16, 2026, U.S. Rep. Julia Letlow captured the top spot with approximately 45 percent of the vote, advancing to the June 27 runoff against State Treasurer John Fleming, who placed second near 28 percent. Incumbent Sen. Bill Cassidy finished third around 25 percent and was eliminated under the state's majority-vote system. Letlow benefited from President Donald Trump's endorsement and positioned herself as a consistent conservative aligned with administration priorities, drawing strong early-vote support across key parishes. Traders reflect this first-round performance and institutional backing in their assessments of the runoff outcome, where Letlow holds a substantial lead entering the final contest. No other candidates from the initial field remain competitive.