President Barack Obama and First Lady Michelle Obama greet members of the King family

President Barack Obama and First Lady Michelle Obama greet members of the King family at the conclusion of the Let Freedom Ring ceremony at the Lincoln Memorial in Washington, D.C., Aug. 28, 2013. The ceremony was held to commemorate the 50th anniversary of the historic March on Washington for Jobs and Freedom and Dr. Martin Luther King, Jr.'s "I Have a Dream" speech.