Thousands of people are gathering in Washington to remember the Reverend Martin Luther King Jr's landmark "I Have a Dream" civil-rights speech half a century ago.
MLK: US Celebrates 50th Anniversary of Civil Rights March
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Dr. 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. in this Aug. 28, 1963 file photo.
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A tourist points to the exact location where Rev. Martin Luther King Jr., gave his famous 'I Have a Dream' speech, at the Lincoln Memorial in Washington, Aug. 22, 2013.
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Rev. Al Sharpton (2nd R) links arms with Rep. John Lewis (D-GA) next to Martin Luther King III (R) as they begin to march during the 50th anniversary of the 1963 March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington, Aug. 24, 2013
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Crowds rally at the Lincoln Memorial in Washington to commemorate the 50th anniversary of the 1963 March on Washington, Aug. 24, 2013.