The U.S. House race is the major statewide race we are watching closely.
Two years ago, Republican Kristi Noem unseated Congresswoman Stephanie Herseth Sandlin to win South Dakota's lone seat in the House by a margin of 48 percent to 46 percent.
Much of Noem's support came out west and in many of the rural areas of South Dakota. Herseth Sandlin's support was in the east along the I-29 corridor and on the reservations.
As the early returns come in Tuesday night, we'll be watching these counties closely to see if Matt Varilek can maintain the Democratic support in these areas. If Varilek can't maintain this support early on in the evening as the eastern South Dakota counties tally the votes, it will likely be very tough for Varilek to win with Noem's strong showing out west two years ago.
One of the other wild cards to watch is two years ago there was a third candidate in the Noem, Herseth Sandlin race. B. Thomas Marking garnered six percent of the vote as an Independent so it will be interesting to see which way that portion of the population votes in this election.