Moderate senator Maggie Tinsman was defeated by 1% in part because she didn't support a draconian ban on gay marriage/civil unions/etc. As of right now there is no Democrat running in that district. The Democrats and Republicans are split 25-25 in the senate, so if this seat can be picked up, that would be a big help.
Joe Hutter, who says he will run as an independent. Again, there is no Democrat. Surely with a vote split 2 ways, a Democrat can win this.
Paul Wilderdyke, who lost in part because of illegal immigration ads. A Democrat is present in this race - Janice Doumakes Creasman
In South Dakota, according to this very conservative site, losses included 3 of the founders of South Dakota Mainstream Coalition lost. They all lost after voting against the state's wide-sweeping abortion ban which will be on the November ballot:
Are any Democrats running in these 4 districts? What are the districts like?