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. Monday, Jan. 17, 2011, marks the 25th federal observance of the birth of King, one of America's most celebrated citizens, and the only non-U.S. president to be honored with a national holiday. (AP Photo/File)
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