Typical democrats, they’ll turn on anyone if they think it will help them personally, no matter who it is! It’s karma for the Obozo.
It is the “crab syndrome”.
One crab, alone in a bucket, can easily stretch claws and pull itself out of an uncovered bucket.
But two or more crabs, as they see one managing to catch a hold on the top edge of the bucket, will all seize the most adventurous of their group, and drag it back down into the bottom of the bucket.
It is like this with the Democrats. If one seems to be breaking away from the others by getting an advantage to pull himself or herself out, the others will reach out and drag him or her back down in the “comfort zone”.
Joe Biden seemed to have the advantage, citing his association with Obama, so all the others ganged up and “pulled him back”, which was an indirect but very real repudiation of the policies of Barack Obama.
Barack Obama has been left behind by his party - they have dropped him in the dust in their headlong dash to the even further left.