From left, first lady Michelle Obama, Sasha Obama, Ahmed Kathrada former prisoner with Nelson Mandela guiding the tour, U.S. President Back Obama, Marian Robinson and Leslie Robinson, look out over the courtyard of the prison on Robben Island, South Africa, Sunday, June 30, 2013. Former South African president Nelson Mandela spent 18 years of his 27-year prison term on the island locked up by the former apartheid government. (AP Photo/Carolyn Kaster)

Associated Press
From left, first lady Michelle Obama, Sasha Obama, Ahmed Kathrada former prisoner with Nelson Mandela guiding the tour, U.S. President Back Obama, Marian Robinson and Leslie Robinson, look out over the courtyard of the prison on Robben Island, South Africa, Sunday, June 30, 2013. Former South African president Nelson Mandela spent 18 years of his 27-year prison term on the island locked up by the former apartheid government. (AP Photo/Carolyn Kaster)
From left, first lady Michelle Obama, Sasha Obama, Ahmed Kathrada former prisoner with Nelson Mandela guiding the tour, U.S. President Back Obama, Marian Robinson and Leslie Robinson, look out over the courtyard of the prison on Robben Island, South Africa, Sunday, June 30, 2013. Former South African president Nelson Mandela spent 18 years of his 27-year prison term on the island locked up by the former apartheid government. (AP Photo/Carolyn Kaster)
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