If you look at graph the polls NEVER had POTUS leading Biden even back before Biden was the nominee and back when POTUS approval rating was 48/49% so...
Trump was winning in the betting odds, you are looking at the polls what is being referred to is the betting odds where people bet real money on who will win and are much more predictive betting odds here, Trump was w inning right through May 30th then disaster-to the day of his loot we shoot messages, these odds can turn around but he needs to be on message and less impulsive tweets-AND pray the economy comes back
https://www.realclearpolitics.com/elections/betting_odds/2020_president/