I am willing to acknowledge that potential change in GA could be grassroots. It doesn't explain why a similar thing occurred around the major cities in PA, WI, and MI. I can't find the same occurrence in places that were already going to go blue, or even in slight leaning red states with heavily populated blue counties. You don't see it in Chicago. You don't see it in Cleveland. There's nothing even close to it in FL (who tightened up their voting regulations). There could be plausible explanations for it, but you would think that you'd see this repeated nationwide. You just don't really see it. Just a few counties in each swing state.

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Trump has also had spikes, so it's not impossible. The highest I can find for Trump is 34%, and I, if I recall, it was only one county in all that I've looked at. He had pretty consistent bumps across the board. Biden had 46% in a couple counties in each swing state, then nothing like it anywhere else. He underperformed Hillary in several blue states. It's just odd.

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