WASHINGTON (Reuters) - Republican presidential candidate Mitt Romney was accused on Wednesday of flip-flopping for comments he made in 2007 indicating he was open to a pathway to citizenship for illegal immigrants. Romney's remarks, made on NBC's "Meet the Press" when he was a candidate for president, were circulated by rival Newt Gingrich's campaign the day after the former Speaker of the House of Representatives came under similar fire for suggesting during a debate Tuesday night that he was in favor of such a pathway for immigrants. Opponents of a pathway, a large swath of the early-voting Republican electorate, have...