I and many others said this on the eve of Super Tuesday and were accused of being conspiracy theorists.

It's been crystal clear all along that the Democratic Party establishment was more unified and strategic in taking down #Bernie than effectively opposing the GOP. https://twitter.com/hollyotterbein/status/1248943007476391938

Imagine Biden had won the first three states. Dem leaders would have raced to endorse him and tell other candidates to drop out.

Now imagine the Obamas, Clintons, and the rest of the party elders eagerly endorsing Bernie after his early wins. Wouldn't that have affected voters?