The deep south has a distinct blue steak that goes from Memphis down to Greenville, Mississippi. It turns east, and goes through Montgomery to Atlanta and all the way to Georgetown, SC.
It's this blue streak that came up with the votes in Georgia for the runner up in the governor's race.
In the past, the northern Atlanta Perimeter was solidly Republican, but the changing demographics is a sign that younger people are moving into that area and that the older, conservatives are exiting Atlanta in mass.
Since I left a northeast Atlanta suburb 15 years ago, my county of 1,000,000 people has had 320,000 whites move elsewhere--replaced by a very diverse population of blacks, Koreans, other Asians and many Hispanics. The voting earlier this week is an example that big cities do change--and not always for the best.
Davidson County, Tennessee is another example how voters can totally change in a 10 year period with a huge new population of Hispanics, Vietnamese and Kurds.