In early 2020, Sanders flipped Biden, leading more than Trump lead his rivals for much of the primary, and likely would have gone on to win the nomination, with the momentum he was carrying into the bulk of state contests. Biden's centrist rivals colluded with him and the DNC, suddenly dropping out before Super Tuesday. Buttigieg, one of the dropouts, was awarded with a cabinet appointment that he was completely unqualified for, as exemplified by his gross mishandling of first a rail strike, and then a large accident (caused by conditions the strikers were organizing to rectify) which dumped toxic chemicals into a small town.
That was the one I paid close attention to. If 2016 was anything like it (and I'm sure it was, considering this year's convention tactics were used all the way back in the 1940s to force Truman on us), I have no doubt that this is the DNC's modus operandi. The true steal of the last 3 elections were establishment Democrats' theft of the liberal and leftist vote. And in 2 out of 3 of those cases, they paid in the general.