To be fair, Romney won Cobb by 13% so it wasn’t that easy to foresee, (or maybe their were signs back then?). But people definitely had their heads in the sand regarding signs that Democrats were collapsing in heavily WWC areas. There was a SUSA poll showing Trump+12 in MN-08 in 2016 (he won by 15), and people were pretty quick to dismiss it: https://talkelections.org/FORUM/index.php?topic=249461.25
Trump is winning both counties. It's not even a question.
Cobb is still reliably Republican. Gwinnett is as well. The dynamics of Cobb will not show a 13-point shift to the Ds from 2012. The dynamics of Gwinnett will not show a 9-point shift.
It's an Atlas pipe dream that either of those two counties end up in the Hillary! camp come November. But you can dream, red avatars, even as the polling tightens back to pre-convention levels.
https://talkelections.org/FORUM/index.php?topic=244083.0Also, lol at that MN-08 poll thread. And it's not like that's the only poll showing a D collapse in WWC areas, there were many, many others, like
these Siena polls of NY-01 and
NY-19.