Pennsylvania was very tight in 2016 therefore I believe this new poll from Monmouth is off:
Democrat strong in swing counties; close House ballot
www.monmouth.edu
I've said this for decades.
Never underestimate the power of stupid people in large numbers.
It is still very possible that Biden could be elected.
You get enough ignorant fools in one place, and you can turn the most wealthy oil rich country in all of South America, into a pet-eating, starvation, crime filled, hell hole.
If you just gather enough morons in one place, you can turn an island with modern (at that time) health care system, into a impoverished wasteland where people can't even get Aspirin, and people are trying to float 1950s cars from Cuba to Miami.
So... we'll see. I personally still think Trump will win. But you never known. There are tons of stupid people in this country. Look at AOC saying the reason for all the murders in NYC, is because they want bread to feed their babies.