U.S. President Barack Obama walks off stage after making his second annual back-to-school speech in Philadelphia

 
U.S. President Barack Obama walks off stage after making his second annual back-to-school speech in Philadelphia
U.S. President Barack Obama walks off stage after making his second annual back-to-school speech at Julia R. Masterman Laboratory and Demonstration School in Philadelphia, September 14, 2010. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS EDUCATION)