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President Barack Obama speaks to crowds attending the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham)
President Barack Obama speaks to crowds attending the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham)

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U.S. President Barack Obama pays tribute at the Nelson Mandela Memorial.

Mandela Remembered: Obama's full speech

U.S. President Barack Obama pays tribute at the Nelson Mandela Memorial.