SPARTANBURG, S.C. -- A group supporting Republican presidential candidate Newt Gingrich says it will remove errors from a film it made about Mitt Romney's business experience – if Romney helps them figure out what is inaccurate. The political action committee Winning Our Future sent Romney a letter asking him to respond to several questions about his tenure at Bain Capital, a private equity firm. The PAC, run by Gingrich allies, says the questions will help clarify any errors in a film the group released this week assailing Romney's experience at Bain.