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?
Democrats outvoted Republicans 61-39 in the primary this year in Cobb County so I wouldn't be so sure about that. That's not guaranteed to be an exact mirror of the general election, but it does show a massive shift from previous years. With that said, Biden doesn't even need to reach 60% there to hit the winning benchmark, he only needs about 55-56%.
