Opinion polling for the 2026 Louisiana U.S. Senate Republican primary. Incumbent Senator Bill Cassidy, who voted to impeach Trump following January 6th, faces a tough primary-challenge from Trump-endorsed Julia Letlow and John Flemming. (May 16 election; June 27 runoff if no candidate clears 50%).
| Date | Pollster | Sample | Cassidy | Fleming | Letlow | Margin |
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