Iowa state Sen. Brad Zaun (R) is joining the race against Rep. Leonard Boswell (D) in the Des Moines-area 3rd district.Zaun, who is serving his second four-year term in the state Senate, said in an interview Thursday afternoon that he would make a formal announcement of his political plans after Dec. 1.“My intentions are to run against Leonard Boswell,— said Zaun, a vice president at the commercial real estate firm R&R Realty Group.Zaun, a former mayor of the Des Moines suburb of Urbandale, said that Boswell is “out of touch— with his constituents. He said that Boswell expressed qualms about a cap-and-trade energy bill and indecision about a health care bill but then voted for both measures.“He says one thing in Iowa and he does the opposite in Washington, D.C.,— Zaun said.Jim Gibbons, a former wrestling coach at Iowa State University, is also getting into the race against Boswell. Gibbons left coaching in 1992 and is now a financial adviser and television analyst. Boswell has been somewhat of a perennial target for Republicans because he represents a swing district that only marginally favors Democrats. His lowest re-election margin came in 2006, when he won with just 52 percent of the vote.