CNN writes, (CNN) - One of the two Republican congressmen considering a 2014 bid for an open U.S. Senate seat in Iowa says he is staying put in the House. Rep. Tom Latham announced Wednesday that he will not campaign for the seat of longtime Democratic Sen. Tom Harkin, who late last month announced that he wouldn't run in 2014 for a sixth term in office.Follow @politicalticker In an email to supporters, Latham acknowledged that he was interested in making a bid, saying "The opportunity to serve Iowa in the U.S. Senate is appealing to this farm kid who grew up here, raised a family here, and helped grow a…