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I would guess that the polling issue is that some demographic group or groups that pollsters expected to turn out for Kamala Harris didn't turnout in the way they did for Biden in 2020.
It's not that, it's that the polls have underestimated Trump in the past and they did so again. It's not everywhere all the time but it's enough places enough of the time. It explained the results in five out of the seven swing states.
It might be that as well, I suppose...
I think the polls were within the margin of error, including in the swing states, which is where the too close too call came from. I would guess that the polling issue is that some demographic group or groups that pollsters expected to turn out for Kamala Harris didn't turnout in the way they did for Biden in 2020.