Former South Dakota Governor Mike Rounds has turned in his petition signatures to run for the United States Senate.
Campaign officials for Rounds said on Monday the former governor turned in more than 7,000 signatures.
Rounds is just one of five Republicans running for the seat. Other candidates include Annette Bosworth, Stace Nelson, Jason Ravnsborg and Larry Rhoden.
Rick Weiland is the only declared Democrat in the race. Larry Pressler is also running as an Independent.