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Robert Marion La Follette Sr. (1855–1925) was an American lawyer and politician from Wisconsin. He served as the 18th governor of Wisconsin (1901–1906) and was a candidate for President of the United States in 1908 and 1912. He was the father of Senator Robert M. La Follette Jr. and Senator and Progressive Party candidate for President of the United States in 1924, Robert M. La Follette Jr.