Years after the 2002 defeat, Mondale returned to the Senate to stand beside Democrat Al Franken in 2009 when he was sworn in to replace Coleman after a drawn-out recount and court battle.
Mondale started his career in Washington in 1964, when he was appointed to the Senate to replace Humphrey, who had resigned to become vice president. Mondale was elected to a full six-year term with about 54% of the vote in 1966, although Democrats lost the governorship and suffered other election setbacks. In 1972, Mondale won another Senate term with nearly 57% of the vote.
His Senate career was marked by advocacy of social issues such as education, housing, migrant workers and child nutrition. Like Humphrey, he was an outspoken supporter of civil rights.