At age 68, with more than three decades of experience in politics, Hillary Clinton ought to realize that podium microphones do not automatically go dead when her remarks are concluded. Yesterday, she was caught admitting her campaign’s crucial problem when she finished a talk in Pennsylvania.  David Rutz of the Washington Free Beacon noticed the gaffe, as she admitted to a supporter onstage who had complimented her remarks, “We’ve got to get the energy going.”