I like the first and third sites best.
Polls?
follow the money! Trump is on top with ALL the bookies!
The list of potential winners of the 2020 United States presidential election has been cut in half in the latest odds release and Republican voters will be happy to see that Donald Trump’s re-election odds continue to look promising.
https://www.oddsshark.com/other/2020-usa-presidential-odds-futures
https://www.oddschecker.com/politics/us-politics/us-presidential-election-2020/winner
https://www.sportsbettingdime.com/politics/us-presidential-election-odds/