Not like people should read too much into it, and the accuracy is questionable this year anyway but how will the exit polls be conducted this year, especially with the drastic change in voting behavior?
To counter, as I say when this question comes up, how much different is it from states like California/Colorado with overwhelming to 100% mail ballots? They don't seem to have had problems with exit polls.
The only state I can see a big problem with is Pennsylvania, which seems to be having a hell of a time with mail ballots
