ST. PETERSBURG -- There are two million Hispanic voters in Florida. It's a constituency that has the power to shift a tight election, so both political parties have tried to sway the Hispanic vote their way. An exclusive Tampa Bay Times/Bay News 9 statewide poll shows many Hispanic voters dropping their support for Obama. Last month, 52 percent of Hispanic voters polled said they would vote for the president. That has now dropped to 44 percent. Romney picked up some ground among Hispanics, from 43 percent to 46 percent. And the number of undecided Hispanic voters has doubled from 5...