I think it represents about 3 points. So an 8.8 difference is really about a 2.8 difference, which is right around where Trump needs to be to lose the PV but win the EC.

What I'd really like to see is Biden getting his polling above 50%. Not just for him to win, but for the sake of peace on the streets from MAGA types his victory needs to be firm - winning back most or all of the states Trump flipped, plus creaming Trump in the purple states. The more narrow a Biden victory the more room Trump has to pull tricks.