polls are probabilistic and on comparatively small samples. A few points one way or the other can easily go past them but over millions of voters it's gonna look like landslide
  • plenty of modelling (say, Nate Silver) struggled with one-off effects in 2020 and 2022
There's also no real way to control for the selection effects of who decides to respond to polls, not to mention whether people answer polls honestly.
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Public polls from ABC, NYT, WaPo have ulterior motives like voter suppression
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