Brian Beutler explores the week's East Coast primaries—PA, CT, MD, RI, and DE—with a focus on what it all means for Bernie Sanders. MSNBC’s Chris Hayes discusses Sanders's next move and the long-term future of progressive politics. Then, Buzzfeed’s Evan McMorris-Santoro talks about his time on the bus with Sanders, and recounts the exciting ebbs and flows of the campaign over the past year.