The polls show biden much farther ahead than clinton ever was in several swingstates. I just saw a Fox news poll that showed this today and a Rasmussen poll from like yesterday or so that showed this too.
I think that Trump is in very real trouble and that moderates and undecided (if there are any) aren't breaking his way.
The 2016 polls were actually pretty accurate by my recollection. Nationally they showed clinton ahead and they turned out right. State wise they showed the race within the margin of error and again they were right.