I don't understand this post really. Nothing against you, but FL is the definition of a swing state. Obama won it by more in 2008. I call it a bellwether state. It's pretty much a reflection of the mood of the rest of the country to some extent. I see it now drifting red. If Blacks, who were wildly enthusiastic about Obama in 2008 could only get it by 2% over McCain, Hillary has no shot in hell.
Sanders could likely get disaffected voters who don't want to be seen as racists, has no more faith in the establishment after dealing with Rick Scott, or just feel a new direction is needed. Hillary is not going to draw those people, and will lose Black enthusiasm in all areas too. She has little shot, as people are going to get fires up to beat Trump, but that's not going to really draw as many people as a promise of a brighter future would. It's not a change election for Hillary.
Polling spots have either been closed or moved, nationwide, for a while now, despite demographic shifts. Our voting patterns hasn't really changed that much. You may can contribute 2008 lines to people going nuts for Obama, but 2012 was just normal. You get lines, because there are fewer places to vote.
Bottom line: Hillary has no safe places outside of New York, Massachusetts, California, Washington State, Delaware, and Vermont imho.