The Senate Conservatives Fund has not endorsed anyone so far. They state “Iowa is on our 2014 Priority List because it presents conservatives with a potential pick-up opportunity. Incumbent Democratic Senator Tom Harkin is retiring and a strong conservative can win this open seat. President Obama only narrowly won Iowa in 2012 with 52% of the vote.”
The candidates running for the seat are David Young R , Joni Ernst R , Matt Whitaker R , Sam Clovis R Supports The Fair Tax. I think I would opt for Sam Clovis simply becasue he supports The Fair Tax.