Pres Obama observes a moment of silence during his meeting with senior advisors in the Oval Office at 2:49 P.M. to mark the one-year anniversary of the Boston Marathon bombings. Pictured from left, are Senior Advisor Dan Pfeiffer, Press Secretary Jay Carney, Chief of Staff Denis McDonough, Senior Advisor Valerie Jarrett, Communications Director Jennifer Palmieri, and Katie Beirne Fallon, Director of Legislative Affairs.