sturg33
I
Simply falling within the margin of error doesn't automatically eliminate problems with the polls. If the polls were off simply because of margin of error then you would expect them to be off both ways. Some would have Trump doing better, others would have Biden doing better. It would be random as they would be flukes of random sampling.
However, what we saw is the polls consistently were off in favor of Biden. And not off by small amounts. Off in amounts that stretch the margin of error to its limit. When you see polls consistently off in one direction there's a good chance something was wrong with the polls.
Exactly
They were all off and they were all off in one direction