South Africa

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President Obama gestures during a news conference with South African President Jacob Zuma, not pictured, at the Union Building on Saturday, June 29, 2013, in Pretoria, South Africa. (AP Photo/Evan Vucci)

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President Obama pauses during a town hall meeting with young African leaders at the University of Johannesburg Soweto on Saturday, June 29, 2013, in Johannesburg, South Africa. (AP Photo/Evan Vucci)

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U.S. first lady Michelle Obama waves to the audience during a youth event at the Sci-Bono Discovery Centre, Saturday, June 29, 2013, in Johannesburg, South Africa, organized in conjunction with MTV Base, an African youth and music TV channel, and Google+ to highlight the importance of education. (AP Photo/Carolyn Kaster)

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U.S. President Obama gestures during a news conference with South African President Jacob Zuma, not pictured, at the Union Building on Saturday, June 29, 2013, in Pretoria, South Africa. (AP Photo/Evan Vucci)

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President Obama and first lady Michelle Obama arrive at Waterkloof Air Base, Friday, June 28, 2013, in Centurion, South Africa. The president is in South Africa, embarking on the second leg of his three-country African journey. (AP Photo/Evan Vucci)

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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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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)