Elizabeth Warren is, I think, a great demonstration of the kind of movement-oriented model-wielding power from within the Senate. Over and over, she's rallied tons of people to battles that they don't normally get involved in.
When [Bernie] Sanders was challenged about how he would pass his visionary ideas after he became president, he talked about if lawmakers look out the window and they see a million people marching, it changes their calculus. Well, here's an opportunity to continue working to organize these million people even if he is not the one in office.
There is a question as to whether these rallies  are going to stop in the fall. I think they should continue. They are a tremendous display of energy but also a source of energy, because people come out of them ready to fight.
I think changing the Democratic Party platform [at the convention] is a great place to start. It should include expanding Social Security, a $15 minimum wage, and breaking up too-big-to-fail banks on Wall Street - among other Sanders priorities.