WASHINGTON, DC – OCTOBER 16: (AFP OUT) U.S. President Barack Obama, walks hand-in-hand with daughter Malia as he is followed by (L-R) first lady Michelle Obama, Harry Johnson, president and CEO of the MLK National Memorial Project Foundation, Andrea King carrying daughter Yolanda, and Michelle Obama’s mother Marian Robinson (R) as they arrive for the dedication of the Martin Luther King, Jr Memorial on the National Mall October 16, 2011 in Washington, DC. The ceremony for the slain civil rights leader had been postponed earlier in the summer because of Hurricane Irene. (Photo by Mike Theiler-Pool/Getty Images)