I agree with Kyle here. Having a simply inside person as president who is progressive isn't going to result in the change that we'd like, such as Medicare For All. Even with a Democratic super-majority. There will be segments in the Democratic Party who are corporate-backed Democrats or Democratic representatives in highly conservative districts who will not vote for bills that a President Warren will propose. An inside-outside strategy is how real, massive change is made. A social democrat president, and millions to back them up at DC to protest with a list of demands that will have been laid out, ideally by a President Sanders. Bernie is the only one calling on the people to fight with him. That's an important distinction.
It's also never going to happen. Because it's fictional. The dude can't hit 20% in the primary, but he has MILLIONS who are going to march on the capital? Like Mitch will give two shits about that.
The revolution is never coming.