Article Photos: More than 300 sites ring bells for MLK speech 3/26

Chairs, metal risers and video screens are set up at the Lincoln Memorial in Washington, Tuesday, Aug. 27, 2013, in preparation for the 50th anniversary of the March On Washington celebrations that will be held Wednesday, Aug, 28, 2013. Barack Obama, who is going to speak, was 2 years old and growing up in Hawaii when Martin Luther King Jr. delivered his âI Have a Dreamâ speech from the steps of the Lincoln Memorial. Fifty years later, the nationâs first black president will stand as the most high-profile example of the racial progress King espoused, delivering remarks at a nationwide commemoration of the 1963 demonstration for jobs, economic justice and racial equality.   (AP Photo/Carolyn Kaster)