US President Barack Obama watches as members of the late Dr. Martin Luther King, Jr.’s family ring a bell during the Let Freedom Ring Commemoration and Call to Action to commemorate the 50th anniversary of the March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, DC on August 28, 2013. Thousands will gather on the mall on the anniversary of the march and Dr. Martin Luther King, Jr.’s famous “I Have a Dream” speech. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)