Attached link shows the polls immediately before the 2016 election between Trump and Clinton. Per the polls it would be a wipe out of Trump and we would have had President Hillary.
With rare exceptions the pollsters insert their own political bias into the polls. They are mostly crap. Campaigns pay big bucks for private pollsters to tell them the truth. The public never sees these polls.
https://projects.fivethirtyeight.com/2016-election-forecast/national-polls/
The Democrats were asleep in 2016. They were prepared by 2020 and 2022, and will doubtless have an even better fraud machine this election.