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PRETORIA, SOUTH AFRICA - JUNE 28: U.S. President Barack Obama (L) and first lady Michelle Obama (C) are greeted by Minister of International Relations and Cooperation Maite Mkoana-Mashabne after arriving at Waterkloof Air Force Base June 28, 2013 in Pretoria, South Africa. This is Obama's first official visit to South Africa, where is schedule to hold bilaterial meetings with President Jacob Zuma, host a town hall meeting with students in Soweto Township and visit Robben Island, where former President Nelson Mandela spent some of his 27 years in prison for fighting against apartheid. (Photo by Chip Somodevilla/Getty Images)
PRETORIA, SOUTH AFRICA - JUNE 28: U.S. President Barack Obama (L) and first lady Michelle Obama (C) are greeted by Minister of International Relations and Cooperation Maite Mkoana-Mashabne after arriving at Waterkloof Air Force Base June 28, 2013 in Pretoria, South Africa. This is Obama's first official visit to South Africa, where is schedule to hold bilaterial meetings with President Jacob Zuma, host a town hall meeting with students in Soweto Township and visit Robben Island, where former President Nelson Mandela spent some of his 27 years in prison for fighting against apartheid. (Photo by Chip Somodevilla/Getty Images)

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Pres. Obama is on a tour of Africa. But will he visit an ailing Nelson Mandela while there? CNN's Jessica Yellin reports.

Obama and Mandela's relationship

Pres. Obama is on a tour of Africa. But will he visit an ailing Nelson Mandela while there? CNN's Jessica Yellin reports.