This will probably be important for the Democrats to retain:

Sen. Tom Harkin (D-Iowa) won’t seek reelection

Sen. Tom Harkin (D-Iowa), a five-term senator and one of his party’s most outspoken liberals, will not seek reelection in 2014, presenting Democrats and Republicans with key tests of their midterm electoral strategies.

Iowa is a “purple” state in the oil-and-water type of way - simultaneously having one of the most liberal and most conservatives of senate delegations.

I wonder if Steve King will run for this seat?