Former Massachusetts Gov. Mitt Romney answers reporters' questions after he talked about the economy at Vermeer Corporation in Pella, Iowa, on Wednesday. He'll be participating in a debate with other Republican presidential candidates on Thursday. (Associated Press)

Former Massachusetts Gov. Mitt Romney answers reporters' questions after he talked about the economy at Vermeer Corporation in Pella, Iowa, on Wednesday. He'll be participating in a debate with other Republican presidential candidates on Thursday. (Associated Press)