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President Obama marks I Have a Dream speech

28 August 2013 Last updated at 18:54 BST

The US is marking the 50th anniversary of the March for Jobs and Freedom, the civil rights rally at which Martin Luther King Jr made his historic I Have a Dream speech.

President Barack Obama will make a speech from the same spot on the Lincoln Memorial in Washington DC, at which members of the King family and veterans of the march will be present.

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