The left and the center are together under the Democratic Party umbrella. The Clintons forged the New Democratic formula after the party had become lifeless for being too taken by the pure left. They dread going back there. Even if the ground reality has changed.
The Bernie crowd has had to google the word socialism. This is the crowd that will deliver the Universal Basic Income. This crowd will steer the conversation from liquid water physics to steam physics.
You do that by running for office at all levels. That is the only way.
Hillary won. She picked who she wanted to pick. That is what winning means. You get to pick.
For now the best bet progressives have is to work towards a large mandate. I hope Warren goes to every state.