Who is the first person to represent three states in the U.S. Senate: Illinois, Minnesota and Missouri?

James Shields (May 10, 1806 - June 1, 1879) was an Irish American politician and United States Army officer, who is the only person in U.S. history to serve as a Senator for three different states, and one of only two to represent multiple states in the U.S. Senate. A member of the Democratic Party, Shields represented Illinois from 1849 to 1855, in the 31st, 32nd, and 33rd Congresses, Minnesota from 1858 to 1859, in the 35th Congress, and Missouri in 1879, in the 45th Congress.