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A man holds the official programme ahead of the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Peter Dejong) ( South Africa Mandela Memorial )

A woman sings as mourners wait for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Muhammed Muheisen) ( South Africa Mandela Memorial )

Mourners wait for the memorial service for former South African president Nelson Mandela inside FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Muhammed Muheisen) ( South Africa Mandela Memorial )

U.S. President Barack Obama, left, first lady Michelle Obama, under umbrella, and former President George W. Bush are greeted as they arrive at Waterkloof Air Base for a memorial service in honor of former South African leader Nelson Mandela on Tuesday, Dec. 10, 2013, in Centurion, South Africa. World leaders, celebrities, and citizens from all walks of life gathered for a memorial service on Tuesday to pay respects to Mandela. (AP Photo/ Evan Vucci) ( Obama Mandela )

A mourner poses with his homemade hat before the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Muhammed Muheisen) ( South Africa Mandela Memorial )

A man walks in the rain holding the South African flag as he arrives for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Tsvangirayi Mukwazhi) ( South Africa Mandela Memorial )

The face of Nelson Mandela is shown on a large billboard in the stands at the memorial service for former South African President Nelson Mandela at the FNB stadium in Johannesburg, South Africa Tuesday, Dec. 10, 2013. (AP Photo/Ben Curtis) ( South Africa Mandela Memorial )

A mourner arrives for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/) ( South Africa Mandela Memorial )

Afghanistan President Hamid Karzai, left, shakes hands with Indiaís President Pranab Mukherjee as Sonia Gandhi looks on during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham) ( South Africa Mandela Memorial )

Retired Anglican Archbishop Desmond Tutu, right, arrives with Former U.N. Secretary-General Kofi Annan for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Ben Curtis) ( South Africa Mandela Memorial )

14-year-old Thomas is reflected in the glass of a security barrier as he look across the arena ahead of the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Markus Schreiber) ( South Africa Mandela Memorial )

People look into a tunnel as they wait for the arrival of President Barack Obama during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. World leaders, celebrities, and citizens from all walks of life gathered on Tuesday to pay respects during a memorial service for the former South African president and anti-apartheid icon. (AP Photo/Evan Vucci) ( South Africa Obama Mandela )

Winnie Madikizela-Mandela, Nelson Mandela's former wife, listens to speakers during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham) ( APTOPIX South Africa Mandela Memorial )

Former U.S. President George W. Bush, left, embraces Irish rock star Bono during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Peter Dejong) ( South Africa Mandela Memorial )

JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: U.S. President Barack Obama (L) shakes hands with Cuban President Raul Castro during the official memorial service for former South African President Nelson Mandela at FNB Stadium December 10, 2013 in Johannesburg, South Africa. Over 60 heads of state have travelled to South Africa to attend a week of events commemorating the life of former South African President Nelson Mandela. Mr Mandela passed away on the evening of December 5, 2013 at his home in Houghton at the age of 95. Mandela became South Africa's first black president in 1994 after spending 27 years in jail for his activism against apartheid in a racially-divided South Africa. (Photo by Chip Somodevilla/Getty Images) ( 454753083 )

US President Barack Obama (R) talks with the widow of South African President Nelson Mandela, Graca Machel, during the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. ALEXANDER JOE/AFP/Getty Images ( 525337877 )

Young South African girls dance during the memorial service for the late South African president Nelson Mandela at the First National Bank (FNB) Stadium in Soweto, Johannesburg, South Africa, 10 December 2013. Nobel Peace Prize winner Nelson Mandela died at the age of 95 on 05 December 2013. EPA/DAI KUROKAWA ( SOUTH AFRICA MANDELA DEATH )

People cheer at Soccer City Stadium in Johannesburg as they attend the memorial service for late South African President Nelson Mandela on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. ROBERTO SCHMIDT/AFP/Getty Images ( 525333969 )

President Barack Obama waits to walk to the stage to speak to crowds attending the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. World leaders, celebrities, and citizens from all walks of life gathered on Tuesday to pay respects during a memorial service for the former South African president and anti-apartheid icon. (AP Photo/Evan Vucci) ( South Africa Mandela Memorial )

People cheer as President Barack Obama speaks to crowds attending the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. World leaders, celebrities, and citizens from all walks of life gathered on Tuesday to pay respects during a memorial service for the former South African president and anti-apartheid icon. (AP Photo/Evan Vucci) ( South Africa Obama Mandela )

Mourners sing inside of FNB Stadium as they wait for the memorial service for former South African president Nelson Mandela in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/) ( South Africa Mandela Memorial )

Retired Anglican Archbishop Desmond Tutu speaks at the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham) ( South Africa Mandela Memorial )

President Barack Obama speaks to crowds attending the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. World leaders, celebrities, and citizens from all walks of life gathered on Tuesday to pay respects during a memorial service for the former South African president and anti-apartheid icon. (AP Photo/Evan Vucci) ( South Africa Obama Mandela )

A boy with "Rest In Peace Nelson Mandela" painted on his face looks up to the skies during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Peter Dejong) ( South Africa Mandela Memorial )

People sing songs during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Markus Schreiber) ( South Africa Mandela Memorial )

JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: Members of the public attend the Nelson Mandela memorial service at the FNB Stadium, on December 10, 2013 in Johannesburg, South Africa. Over 60 heads of state have travelled to South Africa to attend a week of events commemorating the life of former South African President Nelson Mandela. Mr. Mandela passed away on the evening of December 5, 2013 at his home in Houghton at the age of 95. Mandela became South Africa's first black president in 1994 after spending 27 years in jail for his activism against apartheid in a racially-divided South Africa. (Photo by Jeff J Mitchell/Getty Images) ( 454746755 )

US President Barack Obama arrives to deliver a speech during the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. BRENDAN SMIALOWSKI/AFP/Getty Images ( 525339605 )

Mourners sing as they stay out of the rain in the hallways of the FNB Stadium as they wait for the memorial service for former South African president Nelson Mandela in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Muhammed Muheisen) ( South Africa Mandela Memorial )

Former British Prime Minister Tony Blair, left, is greeted after arriving for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Ben Curtis) ( South Africa Mandela Memorial )

A woman wears a photo of former South African president Nelson Mandela for his the memorial service for at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Muhammed Muheisen) ( South Africa Mandela Memorial )

Two women kiss the flag bearing the portrait of Nelson Mandela at his memorial service at the FNB stadium in Johannesburg, South Africa, Tuesday, Dec. 10, 2013. Mandela died Thursday at his Johannesburg home after a long illness. He was 95(AP Photo/Tsvangirayi Mukwazhi) ( South Africa Mandela Memorial )

Women pose for a photo as they arrive for the memorial service the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Tsvangirayi Mukwazhi) ( South Africa Mandela Memorial )

Mourners display their Nelson Mandela t-shirts as they wait for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Muhammed Muheisen) ( South Africa Mandela Memorial )

A woman waves a South African national flag ahead of the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Markus Schreiber) ( South Africa Mandela Memorial )

A mourner holding a poster showing Nelson Mandela, bottom, chants slogans during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Muhammed Muheisen) ( South Africa Mandela Memorial )

Actress Charlize Theron speaks with musician Bono before the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Ben Curtis) ( South Africa Mandela Memorial )

Nelson Mandela's widow Graca Machel, right, and his former wife Winnie MadikizelañMandela, left, sit on stage during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham) ( South Africa Mandela Memorial )

Two girls dance in the rain outside of the the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Tsvangirayi Mukwazhi) ( South Africa Mandela Memorial )

A trickle of people arrive for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Tsvangirayi Mukwazhi) ( South Africa Mandela Memorial )

A youth group performs as people arrive for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Tsvangirayi Mukwazhi) ( South Africa Mandela Memorial )

A young man holds a broken umbrella outside of the memorial service of Nelson Mandela at the FNB stadium in Johannesburg, South Africa, Tuesday, Dec. 10, 2013. Mandela died Thursday at his Johannesburg home after a long illness. He was 95. (AP Photo/Tsvangirayi Mukwazhi) ( South Africa Mandela Mourning )

Graca Machel, widow of Nelson Mandela, kisses Retired Anglican Archbishop Desmond Tutu during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham) ( APTOPIX South Africa Mandela Memorial )

Former US President Bill Clinton (R), Former US Secretary of State Hillary Clinton (C), and their daughter Chelsea attend the memorial service of South African former president Nelson Mandela at the FNB Stadium (Soccer City) in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. ROBERTO SCHMIDT/AFP/Getty Images ( 525340063 )

Winnie Madikizela Mandela (L) and widow Graca Machel attend the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. ALEXANDER JOE/AFP/Getty Images ( 525337881 )

An image of President Barrack Obama is flashed on a screen as he makes his speech during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Peter Dejong) ( South Africa Mandela Memorial )

A mourner sleeps during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Markus Schreiber) ( South Africa Mandela Memorial )

Retired Anglican Archbishop Desmond Tutu and musician Bono wave to mourners during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Ben Curtis) ( South Africa Mandela Memorial )

A man kisses a portrait of Nelson Mandela as others shelter under umbrellas during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Bernat Armangue) ( South Africa Mandela Memorial )

Former US presidents Bill Clinton (L), George W. Bush (C) and Clinton's daughter Chelsea Clinton (R) attend the official memorial ceremony for late South African president Nelson Mandela at FNB Stadium in Johannesburg, South Africa, 10 December 2013. Nobel Peace Prize winner Nelson Mandela died on 05 December at the age of 95. EPA/DAI KUROKAWA ( SOUTH AFRICA MANDELA DEATH )

US President Barack Obama (R) and British Prime Minister David Cameron pose for a picture with Denmark's Prime Minister Helle Thorning Schmidt (C) next to US First Lady Michelle Obama (R) during the memorial service of South African former president Nelson Mandela at the FNB Stadium (Soccer City) in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. ROBERTO SCHMIDT/AFP/Getty Images ( 525342163 )

JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: Two young women attend the official memorial service for former South African President Nelson Mandela at FNB Stadium December 10, 2013 in Johannesburg, South Africa. Over 60 heads of state have travelled to South Africa to attend a week of events commemorating the life of former South African President Nelson Mandela. Mr Mandela passed away on the evening of December 5, 2013 at his home in Houghton at the age of 95. Mandela became South Africa's first black president in 1994 after spending 27 years in jail for his activism against apartheid in a racially-divided South Africa. (Photo by Chip Somodevilla/Getty Images) ( 454753419 )

JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: People sing and dance while attending a telecast of the Nelson Mandela memorial service at Ellis Park on December 10, 2013 in Johannesburg, South Africa. Over 60 heads of state have travelled to South Africa to attend a week of events commemorating the life of former South African President Nelson Mandela. Mr Mandela passed away on the evening of December 5, 2013 at his home in Houghton at the age of 95. Mandela became South Africa's first black president in 1994 after spending 27 years in jail for his activism against apartheid in a racially-divided South Africa. (Photo by Justin Sullivan/Getty Images) ( 454754785 )

Women attend the memorial service of South African former president Nelson Mandela at the FNB Stadium (Soccer City) in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. ODD ANDERSEN/AFP/Getty Images ( 525333286 )

A man holds a sign bearing pictures of late South-African president Nelson Mandela , on December 10, 2013 during the memorial service for Mandela at Soccer City Stadium in Johannesburg. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. PEDRO UGARTE/AFP/Getty Images ( 525339968 )

JOHANNESBURG, SOUTH AFRICA - DECEMBER 10: Members of the public celebrate as they arrive at Nasrec Station by train to attend the Nelson Mandela memorial service at the FNB Stadium, on December 10, 2013 in Johannesburg, South Africa. Over 60 heads of state have travelled to South Africa to attend a week of events commemorating the life of former South African President Nelson Mandela. Mr Mandela passed away on the evening of December 5, 2013 at his home in Houghton at the age of 95. Mandela became South Africa's first black president in 1994 after spending 27 years in jail for his activism against apartheid in a racially-divided South Africa. (Photo by Oli Scarff/Getty Images) ( 454637583 )

A security personnel shelters from the rain under an umbrella as they stand behind the stage ahead of the memorial service for former South African president Nelson Mandela at Soccer City stadium in Johannesburg in Johannesburg, South Africa, Tuesday, Dec. 10, 2013. (AP Photo/Themba Hadebe) ( South Africa Mandela Memorial )