2002 Herseth ran unsuccessfully for the
United States House of Representatives in
2002, losing a high-profile race to
Republican governor
Bill Janklow by a smaller than expected margin.
2004 After Janklow was convicted of
manslaughter in a motor vehicle accident, he resigned his seat, effective January 20, 2004, triggering a special election. Herseth was the Democratic nominee, and on June 1, 2004, defeated Republican nominee Larry Diedrich with 51% of the vote. The victory gave South Dakota its first all-Democratic congressional delegation since 1937, including
Senators Tom Daschle and
Tim Johnson. In the regularly scheduled election in November 2004, Herseth beat Diedrich again, with 53.4% of the vote. The vote margin in June was about 3,000 votes, but by the November election, which included a hard-fought contest for Daschle's Senate seat, it grew to more than 29,000. Both the 2004 special and general elections were close compared to most House races the country, and garnered national attention.
2006 In November 2006, Herseth easily defeated Republican nominee Bruce Whalen. She received the second-highest vote total for a Democratic candidate for the House in 2006.
2008 In the November 2008 general election, Herseth Sandlin won a landslide victory over lawyer attorney Chris Lien, winning every county in the state.
2010 (D-MT) and former Senator
Ben Nighthorse Campbell (R-CO), joins other government officials at a speech given by then-president Barack Obama in December 2010, shortly after she lost her reelection bid] Herseth Sandlin was mentioned as a possible, even likely, candidate for
governor of South Dakota in
2010, The
Rapid City Journal editorial board wrote that Herseth Sandlin should take this concern seriously.
Roll Call called Noem's charges an attempt "to stoke anti-Beltway emotions". Noem defeated Herseth Sandlin in the November 2 general election with 48.14% of the vote to Herseth Sandlin's 45.9%. ==Post-congressional career==