At least Scott's numbers are improving...
This is definitely a winnable race for Scott, even against Crist. Though I agree with Maxwell that this will essentially be a race to the bottom. Personally, if I were in the Scott campaign, I would encourage Scott to start attacking Crist early and often, in the hopes of possibly getting Crist out in the primary (which is entirely possible, assuming a majority of Florida Democrats have actual principles and aren't willing to throw themselves at any candidate just to win).
Scott barely won in a wave election, and he has done little to strengthen his support. He has connections to corrupt activities. All that the Democratic opponent needs do is to expose Scott's sleazy practices in business and the Democrat wins.
