An audience member raises their hand at a presidential campaign event for Bernie Sanders on September 27, 2015, in Des Moines, Iowa. The Sanders campaign implicitly calls upon us to begin talking about how we might move beyond the Bernie Sanders political battle. (Photo: Phil Roeder; Edited: LW / TO)

Following Hillary Clinton's primary victories over Bernie Sanders this week, progressives are wondering whether the enthusiasm generated by his campaign can weather electoral losses and, more importantly, whether Sanders' candidacy has engendered new forms of political mobilization that will last beyond the 2016 primaries.