There is about dozen GOP candidates trying to win the primary, 5 are some what credible, so far none of them appear to be too deep in the religious right's Kool-Aid and potentially have a chance of getting some democrat votes.
There is just one Democrat
http://www.brucebraley.com/This is for the open Senate seat due to Tom Harkin retiring.
Iowa is neither a Red nor a Blue State, most people are usually fiscally conservative and socially I don't give a crap.