Partly financed by the Service Employees International Union, this documentary by Glenn Silber looks at the role the union played in securing Barack Obama’s presidential nomination and election. Silber might have turned this into a verite-style portrait of an individual activist or a hard-edged look at how the union’s grassroots activities affected the race. Instead his video skims the surface, cheerleading for the organization but offering little substance. There are fascinating moments: Obama mopping floors and Hillary Clinton assisting a registered nurse as part of SEIU’s “Walk a Day in My Shoes” event, participation in which is required for an endorsement. But these are overshadowed by an endless stream of sound bites and pep talks to volunteers. 74 min.