Nelson Mandela

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Photos, flowers and good wishes laid in support of former South African President Nelson Mandela at the entrance of the Mediclinic Heart Hospital where Nelson Mandela is being treated in Pretoria, South Africa, Tuesday, July 2, 2013. Mandela remained in a critical condition on Tuesday. (AP Photo/Markus Schreiber)

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President Obama, on Sunday, June 30, 2013, peers out from the Robben Island prison cell in which South African anti-apartheid icon Nelson Mandela spent 18 of his 27 years of incarceration. (AP Photo/Carolyn Kaster)

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People are reflected in a window of the house of former South African President Nelson Mandela in Soweto on June 28, 2013. Members of Mandela's family as well as South African Cabinet ministers have visited the hospital where the 94-year-old former president is critically ill. (Associated Press)

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Ruling party supporters, gather outside the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated in Pretoria, South Africa, Thursday, June 27, 2013. Nelson Mandela's health improved overnight and his condition remains critical but is now stable, the South African government said Thursday in a statement that brought a measure of relief to the country. (AP Photo/Themba Hadebe)

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A woman from a community group based in Pretoria holds a candle and sings religious songs to show appreciation and support for former South African President, Nelson Mandela, on the street outside the Mediclinic Heart Hospital where he is being treated in Pretoria, South Africa, Tuesday, June 25, 2013. (AP Photo/Ben Curtis)

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A South African policeman providing security walks past the outside of the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated in Pretoria, South Africa Saturday, June 15, 2013. (AP Photo/Ben Curtis)

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** FILE ** Thabiso Ndandwe walks in front of a mural of former South African President Nelson Mandela in a Soweto township, in Johannesburg, South Africa, Monday, June 10, 2013. Mandela was in serious but stable condition in a Pretoria hospital for the third day Monday with a recurring lung infection. (AP Photo/Themba Hadebe)

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** FILE ** Former South African President Nelson Mandela as he celebrates his 94th birthday with family in Qunu, South Africa, on July 18, 2012. Mr. Mandela just celebrated his 95th birthday on July 18, 2013, while recovering from a lung infection. (Associated Press)