It's pretty obvious that the exit polls (somehow) managed to underestimate Obama's white support in Alabama - else the county results make no sense.
For example, how Winston County- roughly 99 percent white- gave "only" 81 percent to McCain? Maybe, but I'd guess that whites in most black-majority areas voted well over 90 percent against Obama; and metro Birmingham probably had equally extreme polarization, especially in the outer suburbs.
Rural northern Alabama may include the whitest areas of the state, but I don't think we can extrapolate statewide numbers from those counties.
