In 1940, Plauché was the successful Democratic nominee for a seat in the United States House of Representatives. He served in the 77th Congress, January 3, 1941 to January 3, 1943. During his House service, he was a member of the Committee on Irrigation and Reclamation, Committee on Invalid Pensions, and Committee on Patents. He was not a candidate for reelection in 1942, and resumed the practice of law.
