Robert M. La Follette Jr.

Robert Marion La Follette Jr. was an American politician who served as United States senator from Wisconsin from 1925 to 1947. A member of the La Follette family, he was often referred to by the nickname "Young Bob" to distinguish him from his father, Robert M. "Fighting Bob" La Follette, who had served as a U.S. senator and governor of Wisconsin. Robert Jr., along with his brother Philip La Follette, carried on their father's legacy of progressive politics and founded the Wisconsin Progressive Party. Robert Jr. was the last major Progressive Party politician in the U.S. Senate, ending in 1946 when the party disbanded. La Follette was defeated in the 1946 Republican Senate primary by Joseph McCarthy.