Florida is one of a handful of states that doesn't grant automatic "restoration of civil rights" (which includes voting, professional business licenses, etc) to released felons. Florida felons currently apply to the governor for this restoration which apparently is a lengthy process that can take some years.
There is a serious effort afoot to make this restoration automatic and it has governor Crist's support. I've seen numbers tossed around in the press saying roughly 500,000 people would be affected by such an automatic restoration scheme.
Do the math. Florida swings solidly to the democrats in 08' if this goes through.