SIOUX FALLS, S.D. (AP) — Democrats in South Dakota say they won't let U.S. Sen. John Thune run unopposed for the second consecutive election.

The South Dakota Democratic Party is expected to announce a candidate for U.S. Senate by the end of the week.

South Dakota Democratic Party spokesman Michael Ewald says the party is excited to field a competitive candidate. Ewald says the candidate is a man with experience in both private and public sectors.

Thune didn't face an opponent in the 2010 campaign for his second term.

Joshua Shields, Thune's campaign manager, says South Dakota's senior senator always expected he would have a challenger this election cycle. He says the campaign has been focused on raising money and preparing for a race.

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