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JOHANNESBURG, SOUTH AFRICA - JUNE 29: U.S. President Barack Obama answers questions from the audience and from people in Nigeria, Uganda and Kenya via live video link during a "town hall" meeting with the young African leaders at the University of Johannesburg in Soweto June 29, 2013 in Johannesburg, South Africa. South Africa is the second leg of Obama's three-country tour of the African continent, which includes Senegal and Tanzania. (Photo by Chip Somodevilla/Getty Images) ( 171865833 )

U.S. President Barack Obama gestures during a town hall meeting with young African leaders at the University of Johannesburg Soweto on Saturday, June 29, 2013, in Johannesburg, South Africa. The president is in South Africa, embarking on the second leg of his three-country African journey. The visit comes at a poignant time, with former South African president and anti-apartheid hero Nelson Mandela ailing in a Johannesburg hospital. (AP Photo/Evan Vucci) ( Obama Africa )

PRETORIA, SOUTH AFRICA - JUNE 29: Helicopters follow Marine One as US President Barack Obama and wife Michelle Obama leave the Union Buildings on June 29, 2013 in Pretoria, South Africa. This is Obama's first official visit to South Africa, and is holding bilateral meetings with President Jacob Zuma, and also meeting with students in Soweto Township. During his tour the president will also visit Robben Island, where former President Nelson Mandela spent some of his 27 years in prison for fighting against apartheid. (Photo by Dan Kitwood/Getty Images) ( 171859944 )

Bystanders cheer after catching a brief glimpse of U.S. President Barack Obama as he arrives at the University of Johannesburg in Soweto, June 29, 2013. REUTERS/Dylan Martinez ( SAFRICA-OBAMA/ )

US President Barack Obama waves as he leaves the premises of the Nelson Mandela foundation in Johannesburg on June 29, 2013. US President Barack Obama met the family of his critically ill hero Nelson Mandela on a visit to South Africa Saturday, the White House said. The president, whose landmark trip to Africa has been overshadowed by Mandela's illness, decided not to visit the ailing icon, instead meeting family members at the Mandela Centre of Memory in Johannesburg. ODD ANDERSEN/AFP/Getty Images ( 520991735 )

U.S. Secret Service Agents stand guard outside the Nelson Mandela Centre of Memory in Johannesburg June 29, 2013. U.S. President Barack Obama met with family members of ailing former South African leader Nelson Mandela in Johannesburg on Saturday. REUTERS/Jason Reed ( AFRICA-OBAMA/ )

South African Police fire rubber bullets at protesters rallying against President Barack Obama's visit to South Africa, in Soweto on June 29, 2013. At least three bangs were heard as police tried to move the demonstrators away from a university campus where Obama is expected to hold a town hall event later in the day. ALEXANDER JOE/AFP/Getty Images ( 520994399 )

A woman holds a sign during a protest against the US president's visit to South Africa outside the university in Soweto on June 29, 2013. Police fired stun grenades today at hundreds of protesters rallying against President Barack Obama's visit to South Africa. ODD ANDERSEN/AFP/Getty Images ( 520991183 )

Protestors holding Supporters of the South African Communist Party (SACP) signs face police during a demonstration against the visit of the US President in South Africa on June 29, 2013 in Soweto. US President Barack Obama Saturday decided not to visit his political hero Nelson Mandela in hospital to preserve the "peace and comfort" of the anti-apartheid legend, whose family he will meet to offer prayers instead. ALEXANDER JOE/AFP/Getty Images ( 520989733 )

White House staff walk to helicopters that will bring them to a news conference with U.S. President Barack Obama and South African President Jacob Zuma at the Union Building on Saturday, June 29, 2013, in Sandton, South Africa. The president is in South Africa, embarking on the second leg of his three-country African journey. The visit comes at a poignant time, with former South African president and anti-apartheid hero Nelson Mandela ailing in a Johannesburg hospital. (AP Photo/Evan Vucci) ( Obama Africa )

An honor guard lines up for the arrival of US President and First Lady for meetings with South African President at the Union Building in Pretoria, South Africa, on June 29, 2013. US President Barack Obama will not visit his political hero Nelson Mandela in hospital, out of deference for the anti-apartheid icon's "peace and comfort," a US official said today. Obama and his wife Michelle will however spend time with Mandela's family to comfort them in a difficult time, the official said, as the US leader arrived in Pretoria for talks with President Jacob Zuma. SAUL LOEB/AFP/Getty Images ( 520986804 )

U.S. President Barack Obama and South African President Jacob Zuma address a press conference following their meeting at Union Building in Pretoria, South Africa, Saturday June 29, 2013.(AP Photo/Jerome Delay) ( APTOPIX South Africa Obama )

US President Barack Obama raises his glass for a toast during an official dinner hosted by the president of South Africa at the Presidential Guest House in Pretoria, South Africa, on June 29, 2013. SAUL LOEB/AFP/Getty Images ( 520999750 )

U.S. first lady Michelle Obama, centre, participates in a youth event to highlight the importance of education at the Sci-Bono Discovery Centre, Saturday, June 29, 2013, in Johannesburg, South Africa. Teenagers from around South Africa as well as students joining virtually in cities around the U.S. participated. (AP Photo/Motshwari Mafokeng) ( US South Africa Michelle Obama )

Shadows are reflected on a wall where a portrait of visiting US President Barak Obama is displayed outside the Mediclinic Heart Hospital where former South African President Nelson Mandela is hospitalized in Pretoria on June 29, 2013. Mandela, who turns 95 next month, has been in intensive care for three weeks for a recurrent lung disease dating from his years in apartheid-era prisons. MARCO LONGARI/AFP/Getty Images ( 520986013 )

PRETORIA, SOUTH AFRICA - JUNE 29: A girl stands besides an ANC flag depicting Nelson Mandela outside the MediClinic Heart hospital where former South African President Nelson Mandela is being treated on June 29, 2013 in Pretoria. US President Barack Obama met with the former South African leader's family to offer prayers as Mandela continues to be treated for a lung infection. (Photo by Dan Kitwood/Getty Images) ( 171865781 )

U.S. President Barack Obama, middle, and first lady Michelle Obama, right, react as Maite Nkoana-Mashabane, Minister of International Relations and Cooperation, left, gestures during their arrival at Waterkloof Airbase in Pretoria, Friday, June 28, 2013. President Obama is receiving the embrace you might expect for a long-lost son on his return to his father's home continent, even as he has yet to leave a lasting policy legacy for Africa on the scale of his two predecessors. (AP Photo/Themba Hadebe) ( South Africa Obama )

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) ( 171766633 )

U.S. President Barack Obama and first lady Michelle Obama arrive at Waterkloof Air Base in South Africa, June 28, 2013. REUTERS/Jason Reed ( AFRICA-OBAMA/ )

PRETORIA, SOUTH AFRICA - JUNE 28: A man looks at tributes as well-wishers continue to gather outside the Mediclinic Heart Hospital where Nelson Mandela is being treated on June 28, 2013 in Pretoria, South Africa. People continue to gather and lay flowers and tributes outside the Mediclinic Heart Hospital where Mandela is being treated for a lung infection on his 21st day in hospital. (Photo by Christopher Furlong/Getty Images) ( 171750819 )

A group of wellwishers sing and pray for the health of Nelson Mandela at night outside the Mediclinic Heart Hospital where former South African President Nelson Mandela is being treated in Pretoria, South Africa Friday, June 28, 2013. As Nelson Mandela remained in critical condition in hospital Friday, a family feud over where the 94-year-old former president should be buried went to the courts, according to South Africa's national broadcaster. (AP Photo/Ben Curtis) ( South Africa Mandela )

A mural showing former South African President Nelson Mandela is pictured near his former house in Alexandra township on June 28, 2013. US President Barack Obama arrived in South Africa on Friday to pay homage to his hero Nelson Mandela, who was said to be showing "great improvement" in hospital. ALEXANDER JOE/AFP/Getty Images ( DV1518362 )

U.S. President Barack Obama, center left, and Senegalese President Macky Sall, center right, stand at attention while a Senegalese military band plays the American national anthem, as Obama prepares to board Air Force One to depart for South Africa, in Dakar, Senegal, Friday, June 28, 2013. President Obama is receiving the embrace you might expect for a long-lost son on his return to his father's home continent, even as he has yet to leave a lasting policy legacy for Africa on the scale of his two predecessors. (AP Photo/Rebecca Blackwell) ( Obama US Senegal )

U.S. first lady Michelle Obama walks with Marieme Faye, wife of Senegal's President Macky Sall, to Air Force One as the first lady and U.S. President Barack Obama depart Dakar June 28, 2013. REUTERS/Jason Reed ( OBAMA-AFRICA/ )

U.S. President Barack Obama walks with Senegal's President Macky Sall to Air Force One, as Obama departs Dakar, June 28, 2013. Obama heads to South Africa on Friday hoping to see ailing icon Nelson Mandela, after wrapping up a visit to Senegal that focused on improving food security and promoting democratic institutions. REUTERS/Jason Reed ( OBAMA-AFRICA/ )

PRETORIA, SOUTH AFRICA - JUNE 28: Anti-American demonstrators march through the streets while protesting against the official visit of U.S. President Barack Obama June 28, 2013 in Pretoria, South Africa. Organized by the Congress of South African Trade Unions, about 800 people marched through Pretoria to voice their opposition to Obama and U.S. policy in South Africa and around the world. (Photo by Chip Somodevilla/Getty Images) ( 75300815 )

Protesters burn a U.S. flag as they protest against the visit of U.S. President Barack Obama, in Pretoria, June 28, 2013. Obama heads to South Africa on Friday hoping to see ailing icon Nelson Mandela, after wrapping up a visit to Senegal that focused on improving food security and promoting democratic institutions. Obama is in the middle of a three-country tour of Africa that the White House hopes will compensate for what some view as years of neglect by the administration of America's first black president. REUTERS/Siphiwe Sibeko ( AFRICA-OBAMA/ )

PRETORIA, SOUTH AFRICA - JUNE 28: Anti-American demonstrators march through the streets while protesting against the official visit of U.S. President Barack Obama June 28, 2013 in Pretoria, South Africa. Organized by the Congress of South African Trade Unions, about 800 people marched through Pretoria to voice their opposition to Obama and U.S. policy in South Africa and around the world. (Photo by Chip Somodevilla/Getty Images) ( 75300827 )

US President Barack Obama (2nd L) speaks on June 28, 2013 with the head of the Senegalese Federation of Corn Producers, Nimna Diayte (2nd R), before USAID administrator Raj Shah (L) during an event on food security in Dakar. Obama flies to South Africa later on June 27 to pay homage to his former President Nelson Mandela, who is fighting for his life in hospital. JIM WATSON/AFP/Getty Images ( Par7599310 )

U.S. President Barack Obama meets with African drummers on Goree Island near Dakar, Senegal, June 27, 2013. Obama visited the island on Thursday where African slaves in past centuries were shipped west. REUTERS/Jason Reed ( AFRICA-OBAMA/ )

People line the motorcade route of U.S. President Barack Obama on his way to meet with Senegalese President Macky Sall at the Presidential Palace on Thursday, June 27, 2013, in Dakar, Senegal. Obama is visiting Senegal, South Africa, and Tanzania on a week long trip. (AP Photo/Evan Vucci) ( Obama Africa )

U.S. President Barack Obama greets Senegalese President Macky Sall as U.S. first lady Michelle Obama and Senegalese First Lady Mariame Faye Sall look on, at the presidential palace in Dakar, Senegal June 27, 2013. Obama and his wife Michelle are visiting Senegal until June 28 before travelling to South Africa and Tanzania. REUTERS/Joe Penney ( SENEGAL-OBAMA/ )

U.S. President Barack Obama (2nd R) and first lady Michelle Obama (L) are greeted by Senegal President Macky Sall (2nd L) and his wife Mariame at the Presidential Palace June 27, 2013 in Dakar, Sengal. Obama's trip, his second to the continent as president, will take him to Senegal, South Africa and Tanzania. REUTERS/Gary Cameron ( USA-OBAMA/AFRICA )

U.S. President Barack Obama and first lady Michelle Obama (L) are greeted by an honor guard at the Presidential Palace June 27, 2013 in Dakar, Sengal. Obama's trip, his second to the continent as president, will take him to Senegal, South Africa and Tanzania. REUTERS/Gary Cameron ( USA-OBAMA/AFRICA )

People cheer to welcome U.S. first lady Michelle Obama outside Martin Luther King middle school, an all-girls school where Mrs. Obama spoke in Dakar, Senegal June 27, 2013. U.S. President Barack Obama and his wife Michelle are visiting Senegal until June 28 before travelling to South Africa and Tanzania. REUTERS/Joe Penney ( SENEGAL-OBAMA/ )

Senegalese soldiers stand guard near the slave house on Goree Island, ahead of a visit by U.S. President Barack Obama, in Dakar, Senegal, Thursday, June 27, 2013. Obama is calling his visit to a Senegalese island from which Africans were said to have been shipped across the Atlantic Ocean into slavery, a 'very powerful moment.' President Obama was in Dakar Thursday as part of a weeklong trip to Africa, a three-country visit aimed at overcoming disappointment on the continent over the first black U.S. president's lack of personal engagement during his first term.(AP Photo/Rebecca Blackwell) ( Obama US Senegal )

U.S. President Barack Obama and first lady Michelle Obama look out of a doorway that slaves departed from on Goree Island in Dakar June 27, 2013. Obama's trip, his second to the continent as president, will take him to Senegal, South Africa and Tanzania. REUTERS/Gary Cameron ( OBAMA-AFRICA/ )

U.S. President Barack Obama visits the Maison Des Ecslaves, the gathering point where slaves were shipped west in the 1700s and 1800s, at Goree Island near Dakar, Senegal, June 27, 2013. REUTERS/Jason Reed ( AFRICA-OBAMA/ )

A crowd watches as President Barack Obama takes a tour of Goree Island, Thursday, June 27, 2013, in Goree Island, Senegal. Goree Island is the site of the former slave house and embarkation point built by the Dutch in 1776, from which slaves were brought to the Americas. (AP Photo/Evan Vucci) ( Obama US Senegal )

Welcome signs line the motorcade route of President Barack Obama on his way to meet with Senegalese President Macky Sall at the Presidential Palace in Dakar, Senegal, Thursday, June 27, 2013. Obama is visiting Senegal, South Africa, and Tanzania on a week long trip. (AP Photo/Evan Vucci) ( Obama US Senegal )

U.S. President Barack Obama (L) arrives at a joint press conference with Senegal's President Macky Sall at the Presidential Palace in Dakar, June 27, 2013. REUTERS/Jason Reed ( AFRICA-OBAMA/ )

President Barack Obama listens as Senegalese President Macky Sall speaks during a news conference at the Presidential Palace, in Dakar, Senegal, Thursday, June 27, 2013. Obama is visiting Senegal, South Africa, and Tanzania on a week long trip. (AP Photo/Evan Vucci) ( Obama US Senegal )

U.S. first lady Michelle Obama greets students at Martin Luther King middle school, an all-girls school in Dakar, Senegal June 27, 2013. U.S. President Barack Obama and his wife Michelle are visiting Senegal until June 28 before travelling to South Africa and Tanzania. REUTERS/Joe Penney ( SENEGAL-OBAMA/ )

First lady Michelle Obama and Senegal's first lady Marieme Faye Sall watch students dance during a visit to the all-girls Martin Luther King Middle School, Thursday, June 27, 2013, in Dakar, Senegal. (AP Photo/Carolyn Kaster) ( Michelle Obama US Senegal )

U.S. first lady Michelle Obama speaks to students at Martin Luther King middle school, an all-girls school in Dakar, Senegal June 27, 2013. U.S. President Barack Obama and his wife Michelle are visiting Senegal until June 28 before travelling to South Africa and Tanzania. REUTERS/Joe Penney ( SENEGAL-OBAMA/ )

U.S.first lady Michelle Obama hugs students at Martin Luther King middle school, an all-girls school in Dakar, Senegal June 27 2013. U.S. President Barack Obama Obama and his wife Michelle are visiting Senegal until June 28 before travelling to South Africa and Tanzania. REUTERS/Joe Penney ( SENEGAL-OBAMA/ )

U.S. President Barack Obama arrives at the Supreme Court to meet with regional judiciary leaders on the rule of law, in Dakar, June 27, 2013. Obama's trip, his second to the continent as president, will take him to Senegal, South Africa and Tanzania. REUTERS/Jason Reed ( OBAMA-AFRICA )

U.S. President Barack Obama, left, shakes hands with Senegalese President Macky Sall after a joint press conference at the presidential palace in Dakar, Senegal, Thursday, June 27, 2013. President Obama arrived in Senegal Wednesday night to kick off a weeklong trip to Africa, a three-country visit aimed at overcoming disappointment on the continent over the first black U.S. president's lack of personal engagement during his first term. (AP Photo/Rebecca Blackwell) ( Obama US Senegal )

A student claps as U.S. first lady Michelle Obama is introduced at Martin Luther King middle school, an all-girls school in Dakar, Senegal June 27, 2013. U.S. President Barack Obama and his wife Michelle are visiting Senegal until June 28 before travelling to South Africa and Tanzania. REUTERS/Joe Penney ( SENEGAL-OBAMA/ )

U.S. President Barack Obama (2nd L) and his daughter Malia (L) arrive at Goree Island, a former slave trader's port, June 27, 2013 in Dakar. Obama's trip, his second to the continent as president, will take him to Senegal, South Africa and Tanzania. REUTERS/Gary Cameron ( OBAMA-AFRICA/ )

U.S. President Barack Obama greets well-wishers during his visit to Goree Island near Dakar, Senegal, June 27, 2013. Obama visited the island on Thursday where African slaves in past centuries were shipped west. REUTERS/Jason Reed ( AFRICA-OBAMA/ )

A man wearing a t-shirt with the images of President Barack Obama and Senegalese President Macky Sall that says "Yes We Can Yaakaar", yaakaar meaning hope, stands outside the all-girls Martin Luther King Middle School during a visit by first lady Michelle Obama and Senegal's first lady Mariame Faye Sall, Thursday, June 27, 2013, in Dakar, Senegal. (AP Photo/Carolyn Kaster) ( Michelle Obama US Senegal )

Senegalese performers wait along the motorcade route as U.S. President Barack Obama arrives to meet with Senegal's President Macky Sall at the Presidential Palace in Dakar, June 27, 2013. REUTERS/Jason Reed ( SENEGAL-OBAMA/ )

Supporters welcome US President Barack Obama to Senegal along his motorcade route in Dakar on June 27, 2013. US President Barack Obama lavished praise on Senegal as a paragon of democracy on Thursday and said it was leading a drive to good governance in Africa. JIM WATSON/AFP/Getty Images ( 520922607 )

Senegalese President Macky Sall, right, gestures for U.S. President Barack Obama to sit during a bilateral meeting at the Presidential Palace on Thursday, June 27, 2013, in Dakar, Senegal. President Obama landed in Senegal Wednesday night to kick off a weeklong trip to Africa, a three-country visit aimed at overcoming disappointment on the continent over the first black U.S. president's lack of personal engagement during his first term. (AP Photo/Evan Vucci) ( Obama US Senegal )

US President Barack Obama (2nd L) and his delegtion faces Senegal President Macky Sall (2nd R) and his delegation on June 27, 2013 during a bilateral meeting at the presidential palace in Dakar. Obama arrived late on June 26 in Dakar to launch a three-nation trip designed to fulfil neglected expectations for his presidency on a continent where he has deep ancestral roots. JIM WATSON/AFP/Getty Images ( 520920275 )

Security stands guard near a wall covered in posters welcoming US President Barack Obama to Senegal along his motorcade route in Dakar on June 27, 2013. US President Barack Obama lavished praise on Senegal as a paragon of democracy on Thursday and said it was leading a drive to good governance in Africa. JIM WATSON/AFP/Getty Images ( 520922406 )

Senegalese women and children in traditional garb await the arrival of U.S. President Barack Obama and members of his family on Goree Island near Dakar, Senegal, June 27, 2013. Obama visited the island on Thursday where African slaves in past centuries were shipped west. REUTERS/Jason Reed ( AFRICA-OBAMA/ )

A vendor wearing a shawl bearing the image of former South African President Nelson Mandela at the entrance to the Mediclinic Heart Hospital where Nelson Mandela is being treated in Pretoria, South Africa Friday, June 28, 2013. Members of Nelson Mandela's family as well as South African Cabinet ministers have visited the hospital on Friday where the 94-year-old former president is critically ill. (AP Photo/Muhammed Muheisen) ( South Africa Mandela )

White House photographer Pete Souza, left, takes photos of President Barack Obama as he holds a baby after taking a tour of Goree Island, Thursday, June 27, 2013, in Goree Island, Senegal. Goree Island is the site of the former slave house and embarkation point built by the Dutch in 1776, from which slaves were brought to the Americas. (AP Photo/Evan Vucci) ( Obama US Senegal )

U.S. President Barack Obama and first lady Michelle Obama receive a bouquet as they arrive on Goree Island near Dakar, Senegal, June 27, 2013. Obama visited the island on Thursday where African slaves in past centuries were shipped west. REUTERS/Jason Reed ( AFRICA-OBAMA/ )