FILE - This Aug. 28, 1963, file photo shows Dr. Martin Luther King Jr. acknowledging the crowd at the Lincoln Memorial for his "I Have a Dream" speech during the March on Washington. Next Wednesday, the nation’s first black president will stand near the spot where Martin Luther King Jr. stood 50 years ago, a living symbol of the racial progress King dreamed about, and enunciate where he believes this nation should be headed. (AP Photo/File)