Robert Marion "Fighting Bob" La Follette Sr., was an American lawyer and politician. He represented Wisconsin in both chambers of Congress and served as the Governor of Wisconsin. A Republican for most of his career, he ran for President of the United States as the nominee of his own Progressive Party in the 1924 presidential election. Historian John D. Buenker describes La Follette as "the most celebrated figure in Wisconsin history".
Born and raised in Wisconsin, La Follette won election as the Dane County District Attorney in 1880. Four years later, he was elected to the United States House of Representatives, where he was friendly with party leaders like William McKinley. After losing his seat in the 1890 election, La Follette embraced progressivism and built up a coalition of disaffected Republicans. He sought election as governor in 1896 and 1898 before winning the 1900 gubernatorial election. As governor of Wisconsin, La Follette compiled a progressive record, implementing primary elections and tax reform.
La Follette won re-election in 1902 and 1904, but in 1905 the legislature elected him to the United States Senate.