They’ve made it clear over and over again that they’ll never, ever move left or adopt any platform positions desired by the progressives until and unless those progressives withhold their support.

As a counterpoint – the Democratic party is further left than it's been in ages. There hasn't been an administration that's taken climate change more seriously than this. Topics championed by Progressives are discussed within the mainstream party and aspects are included. The infrastructure bill, inflation reduction act, and American rescue plan are all great examples of this.

This didn't happen because progressives withheld their support. It's because progressives gave their support. Bernie ultimately has been the ideological winner. It's clear which direction the party is going. And it's noteworthy that a big reason why he works so well with Biden is that they're friends, or at least friendly colleagues. Biden was friendly to Sanders in the Senate, and that's what opened the door. It's cooperation and friendship that moves the policies we want forward.

This is just as much a lesson to moderates as well, that they need to be a lot more cooperative and conciliatory and way less antagonistic to progressives.