Ron Johnson and Tammy Baldwin represented Wisconsin as senators during the 114th Congressional session in 2015. Since the state's admission to the Union in 1848, Wisconsin has sent 31 senators to Washington, D.C., to serve in Congress.
Wisconsin has produced several historically noteworthy senators. One of the state's first two senators, Henry Dodge served two terms and declined both the Democratic Party's nomination for the presidency and appointment as the governor of Washington Territory.
Two of Wisconsin's most noteworthy senators were the La Follettes, Bob Sr. and Jr. Both started their political careers as pro-labor Republicans and passed through a progressive phase during the early 20th century. After Bob Senior's death in 1925, Robert Junior was elected to fill his vacant seat. While in the Senate, La Follette Jr. led an investigation into unfair labor practices that later expanded into elements of the New Deal. Robert La Follette, Jr. was succeeded by another historically important senator, Joseph McCarthy.
Between 1993 and 2011, Wisconsin's Class 3 senator was Russ Feingold. In 2001, Feingold cast the single vote in the Senate against the U.S. Patriot Act. Feingold served three terms as a democrat before losing his seat to Republican Ron Johnson in the 2010 midterm election.