It's primary day in Florida, where today's high is expected to be 79 in Tampa and GOP voters across the state are casting ballots in the presidential race. Former Massachusetts Gov. Mitt Romney appears headed for victory tonight — but everyone will be watching the margin by which he tops ex-Speaker Newt Gingrich. The final tracking poll by Public Policy Polling (a Democratic firm) found Romney at 39 percent and Gingrich at 31 percent. (more…)