Mitt Romney now leads Newt Gingrich by eight points in the volatile GOP presidential race in Florida, according to a new poll from Insider Advantage. In another Insider Advantage poll released Monday, Gingrich, riding a wave of momentum after his resounding victory in the South Carolina primary, led Romney by eight points, 34 percent to 26 percent. Now, however, after several days in which Romney has hammered Gingrich over his consulting work for mortgage giant Freddie Mac, the former Massachusetts governor leads the former House speaker, 40 percent to 32 percent. In addition to slamming Gingrich on Freddie Mac, Romney...