Gold Standard ABC News Washington Post poll conducted September 2 - 5 has Trump estimated down in the overall vote to Democrat candidates among registered voters as follows:
Biden: Trump down by 15
Sanders: Trump down by 15
Warren: Trump down by 7
Harris: Trump down by 7
Buttigieg: Trump down by 4https://abcnews.go.com/Politics/democra ... d=65415134
For reference, here is how the ABC News Washington Post did with respect to the past four Presidential elections:
That poll's point estimate was within 2 percentage points with respect to the margin all four times. If you look at something like Biden and Sanders being up by 15 over Trump right now in that poll along with Warren and Harris being up 7 and think "the polls are wrong" you are kidding yourself. If Trump was running against any of those four candidates right now he would lose the popular vote.
I also think it's unlikely he'd win the Electoral vote. Especially against Biden or Sanders. It is theoretically possible for a candidate to lose the popular vote by double digits and win the Electoral College but I sure wouldn't bet on it.