Duke Leto
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I live in the south and I see a different attitude among the young whites. They have been raised going to school with different races and openly gay fellow students. They know that bigotry against both is just that, without any bases in fact. I know that Atlanta isn't representative of the south as a whole, but in the past it has been a bell weather of what the south is becoming.
This'd be borne out by my look at exit polls too. (See tab on Exit Polls here.) It's a little tough to get a handle on the Racial composition of Mississippi's Age groups, but it's obvious that White elderly over 65 outnumber the Black elderly something like 3 to 1 (which is heartbreaking because it's a measure of poor Blacks shorter lifespans) and these old Whites' support of Obama is functionally zero, while the Whites under 30 are something more like 25%-35% for Obama. Allowing for even minimal bigotry among Whites under 30, that's going to cause a sea change pretty fast.
Mississippi also does not have an Atlanta, suburban Georgia is going to be a bit less stark.