Obamas Historic Moment

** FILE ** In this Aug. 28, 1963, file photo the Rev. Martin Luther King Jr. acknowledges the crowd at the Lincoln Memorial for his "I Have a Dream" speech during the March on Washington, D.C. Just 45 years since Martin Luther King declared his dream for a colorblind America, the Democratic presidential nomination is within the grasp of a black candidate, Sen. Barack Obama, D-Ill. (AP Photo)