@Brand X,
Barring unforeseen developments, I'll be voting for Sanders in the primaries. But I see a clear path to the nomination for Biden despite my vote.
I won't say the odds are 100% (because they aren't). But if I had to make a guess today as to the probable future nominee, I'd pick Biden as the most likely to win.
That's a shame. Biden hates freedom and civil liberties with a passion matched only by the 9/11 hijackers. But at least it's likely that Trump will defeat him in the general election.