JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: U.S. President Barack Obama (L) shakes hands with Cuban President Raul Castro during the official memorial service for former South African President Nelson Mandela at FNB Stadium December 10, 2013 in Johannesburg, South Africa.
JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: U.S. President Barack Obama (L) shakes hands with Cuban President Raul Castro during the official memorial service for former South African President Nelson Mandela at FNB Stadium December 10, 2013 in Johannesburg, South Africa. Chip Somodevilla Getty Images
JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: U.S. President Barack Obama (L) shakes hands with Cuban President Raul Castro during the official memorial service for former South African President Nelson Mandela at FNB Stadium December 10, 2013 in Johannesburg, South Africa. Chip Somodevilla Getty Images

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