I beg to disagree. The same James Clyburn who had previously vowed to stay neutral turned the tide for Biden in South Carolina and similarly dismissed Harris and Booker. When Harris poked Biden in the first debate, the establishment came out of the woodwork to support Biden and chastise Harris. That included fellow Californian Barbara Boxer. Those same people might support Harris in four or eight years but it wasn’t her time, according to the powers that be. They ultimately joined forces to sink Bernie. Republicans have their own establishment though they have lost ground to the fringe.