Oh God. Not to paint with a broad brush, but the people who tend to be the most aggressively ignorant of how the process works are Berniebros. It is a reliable barometer. Even the most oxy-addled redneck redhat MAGAt understands that you win by actually showing up at the polls, not by tweeting polemics from your basement.
The friend I had who was most obsessed with Bernie Sanders four years ago, or perhaps second-most, told me she was going to write in "Yoshua bin Yusuf" on actual election day (she was going through a "Jews for Jesus" phase at the time, and her refusal to listen to me on
that point is part of why we're not really friends anymore, as she was not herself Jewish). She lived in a state where they literally did not count write-in votes, which is true of a
lot of states in the general Presidential election. I explained that to her, and she ranted conspiracist nonsense about Hillary in response.
Mind you, I'm not saying backroom crap is completely irrelevant, but we don't have a Warren G. Harding situation, here. (For non-Americans, at the time of his nomination only sixteen US states--well under half at the time--even
had primaries, and he was definitely nominated in the stereotypical smoke-filled room despite the wishes of pretty much anyone.) Biden started running so late in the proceedings that several people had pretty well already run through their money and weren't getting support. (Which is part of why I'm a fan of a mandatory no-campaigning-before-this-date day!) There were several good establishment Democrat candidates, including my own state's governor--a much better Old White Guy candidate in my opinion--who could've gotten the nomination if the party wanted to force things, and given some of Biden's shady history, it arguable would've been better for them. There are no allegations of any kind, credible or otherwise, against Jay Inslee.
And now, half my friends seem to have fallen into conspiracist thinking by insisting that the announced positive test is a hoax intended to make us feel sympathy for him before the election or some damn thing. I've explained to a lot of people that this is not an internally consistent lie with what we know of his psychology, but it seems they don't have a lot of exposure to conspiracism and aren't going to get it.