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The 1920 United States Senate election in Louisiana was held on November 2, 1920. Incumbent Senator Edward J. Gay did not run for re-election.
On September 14, Edwin S. Broussard won the Democratic primary with 45.74% of the vote.
At this time, Louisiana was a one-party state, and the Democratic nomination was tantamount to victory. Broussard won the November general election without an opponent.
- Edwin S. Broussard, Progressive candidate for Lt. Governor in 1916 and brother of former Senator Robert F. Broussard
- Donelson Caffery III, Populist candidate for Governor in 1900 and son of former Senator Donelson Caffery
- Jared Y. Sanders Sr., U.S. Representative from Franklin and former Governor of Louisiana
|Democratic||Edwin S. Broussard||49,718||45.74%|
|Democratic||Jared Y. Sanders Sr.||43,425||39.95%|
|Democratic||Donelson Caffery III||15,563||14.32%|
|Democratic||Edwin S. Broussard||94,944||100.00%|