Smith_W._Brookhart--Thomas_Harkin

Smith Wildman Brookhart (February 2, 1869 – November 15, 1944), was twice elected as a Republican to represent Iowa in the United States Senate. He was considered an "insurgent" within the Republican Party. His criticisms of the Harding and the Coolidge administrations and of business interests alienated others in the Republican caucus and led to his ouster from the Senate over an election challenge.
Brookhart's absence from the Senate was brief, as he took the first opportunity to return by challenging and defeating the state's senior Republican senator. He was also a strong supporter of Prohibition and its enforcement, so as public support for prohibition waned, the same occurred to his political career.