General election polls this far out are not good predictors. https://fivethirtyeight.com/features/should-we-take-these-early-general-election-polls-seriously-no/
From his data 2016 was off by 3 points,2012 by just 1 point,2008 7 points,2004 6 points.Considering Biden is leading by over 10 points thats a bad sign for Trump. Approval ratings are a very good predictor.No president with an average first term approval below 49 has ever won a second term,Trumps first term average approval is 39. These current swing state match up polls also resemble many 2018 mid term Senate results.
The same people that rejected HRC would reject Warren...same cookie cutter politician. I think the margin of error shows Trump would beat Warren and Harris pretty easily. No way Warren or Harris pick up any of the red states HRC lost.