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Photo of William M. Cassidy, Republican candidate for U.S. Senate Louisiana
Official portrait, public domain, unitedstates/images · Request photo removal
2026 midterms · FEC S4LA00107

William M. Cassidy

Quick answer. William M. Cassidy is listed as a Republican candidate for U.S. Senate, Louisiana in the FEC 2026 candidate master, ID S4LA00107. This is a filing record, not a statement that the person is on the certified ballot.

U.S. Senate, Louisiana

RepublicanIncumbent

Born 1957. U.S. senator for Louisiana since 2009. Committees: Energy and Natural Resources, Finance, Health, Education, Labor, and Pensions.

Bio: unitedstates/congress-legislators

FEC pageOfficial siteThis raceWhere to vote

Confirm this list with the official sample ballot. Poliwog does not decide who is on the ballot. Retrieved October 31, 2026 from the FEC 2026 candidate master. Receipt totals stay on the FEC page.