Joe Biden lost the election to the Senate in 1972.
Joe Biden . A member of the Democratic Party , he represented Delaware as a United States Senator from 1973 until becoming Vice President in 2009 . He was first elected to the Senate in 1972 , and became the sixth-youngest senator in U.S. history . The United States Senate election in Delaware , 1972 was held on November 7 , 1972 .