I mean, it did involve the DNC deliberately and inexplicably breaking their own rules and dropping in Bloomberg, a completely ineligible candidate, at the very last minute.
Without the far-right Bloomberg making the right-wing Biden appear centrist, things might have gone quite differently.
Who knows? Americans are very right-wing, even though it hasn't worked out for them. They might have voted for Biden anyway, even if the DNC hadn't cheated. But we will never know.