The U.S. Chamber of Commerce has thrown its support behind congressional candidate Adam Kinzinger (R) in Illinois. A former local county commissioner and Iraq war veteran, Kinzinger is challenging freshman Rep. Debbie Halvorson (D), who won easily in 2008.

In a statement announcing its backing of Kinzinger, the Chamber's Vice President of Political Affairs and Federation Relations Rob Engstrom said he's confident Kinzinger will prove to be "an invaluable leader on important business issues in Washington," while hitting Halvorson's voting record in Congress.

“She voted for a job killing tax on energy, supported a government takeover of the health care system, and was a co-sponsor of card check legislation, an undemocratic attempt to strip workers rights to a private ballot election," Engstrom said in the statement.

Halvorson voted in favor of the president's healthcare overhaul and for the Disclose Act, both of which the Chamber lobbied strenuously against. 

Halvorson's district wasn't one that appeared to be a prime pick-up opportunity for Republicans a year ago, but the party is now convinced the race is winnable. Election handicapper Charlie Cook moved the race into the toss-up category earlier this month.