WASHINGTON, DC – JANUARY 16: (AFP OUT) U.S. President Barack Obama and first lady Michelle Obama greet other guests attending the Let Fredom Ring Celebration at the Kennedy Center for the Performing Arts on January 16, 2012 in Washington, DC. The muiscal celebration is in honor of Dr. Martin Luther King Jr. and features singer Bobby McFerrin. (Photo by Mike Theiler-Pool/Getty Images)