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Police officers push back protesters during a demonstration against the upcoming visit of United States President at the university in Soweto near the university in Soweto, South Africa, Saturday June 29, 2013. Mandela remains in critical condition in a Pretoria hospital as U.S. President Barack Obama visit South Africa as the second leg of his African visit. (AP Photo/Markus Schreiber)

Associated Press
Police officers push back protesters during a demonstration against the upcoming visit of United States President at the university in Soweto near the university in Soweto, South Africa, Saturday June 29, 2013. Mandela remains in critical condition in a Pretoria hospital as U.S. President Barack Obama visit South Africa as the second leg of his African visit. (AP Photo/Markus Schreiber)
Police officers push back protesters during a demonstration against the upcoming visit of United States President at the university in Soweto near the university in Soweto, South Africa, Saturday June 29, 2013. Mandela remains in critical condition in a Pretoria hospital as U.S. President Barack Obama visit South Africa as the second leg of his African visit. (AP Photo/Markus Schreiber)
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