Saving this for when Biden cracks 60% in Gwinnett.
Gwinnett is the poorest, most diverse of Atlanta's northern suburbs.
Biden is gonna win Cobb and ex-Milton too.
Biden will not approach anywhere near 60% in Cobb or North Fulton, even though these counties are both becoming increasingly diverse (South Cobb is essentially an extension of West Atlanta/Douglas, it's over 60% Black.) He may break 60% in Gwinnett only because it's the poorest, most downscale of Atlanta's northern suburban counties. There really aren't these Romney-Clinton voters you obsess over as much as there are Romney-Clinton places.
Also: how come when talking about Georgia's suburban 
Romney-Clinton counties no one seems to give any love to South Atlanta's Henry County (even though it's the most Democratic of any of them)? Might it have something to do with it only being 55% White and 36% college-educated? Doesn't quite fit your narrative I guess, hmm?
I agree that Henry county is underrated. Another neglected county I would note is Newton County, which Obama and Clinton won by 1/2/2, but Abrams won by 9.
