Biden BARELY beat him the first time around and conditions are WORSE this time around:
1: The electorate has a ridiculously short memory and aren't currently suffering from Trump being president.
2: Related to but distinct from 1, Biden's main strategy of "at least I'm not the other guy" is much less effective for an incumbent than a challenger.
3: Biden is currently alienating a large part of his own base by supporting two seperate genocides (Gaza and Yemen), one of which Democrats actually care about even when there's a Dem president.
Don't get me wrong, I REALLY want him to win since he's by far the lesser evil, but for the above reasons and others, there's a significant risk of him actually losing if the traitor isn't disqualified as he should be