But, if you just look at the white vote, the south gives 70-90% of their votes to Bush.
Depends on what state you're looking at. I don't think there are many places where he got 90%. In fact, that's sort of my point. But if you want to believe that the South has not changed in the last 3 to 5 decades, go ahead. It's a bit too deluded for me to want to argue the point. I'll just point out that blacks can actually hold office in those states now.
Lynchings are also uncommon, segregation is no longer around, and there is a possibility that you could actually live as a gay person in parts of the South. Is it still behind the rest of the country? Of course however it has progressed since the 1950s. To say that it hasn't is quite delusional.