Secretary of State Hillary Rodham Clinton meets with former South Africa President Nelson Mandela, 94, at his home in Qunu, South Africa, Aug. 6, 2012.

Family members wishing Nelson Mandela a happy 94th birthday at his home in Qunu, Eastern Cape, South Africa on July 18, 2012.

Former US President, Bill Clinton, right, meets with former South African President Nelson Mandela at his home in Qunu, South Africa, July 17, 2012 on the eve of Mandela's 94th birthday.

On her first solo trip to Africa, U.S. first lady Michelle Obama views former President Nelson Mandela's newest book titled "Nelson Mandela by Himself" at his home in Houghton. In a statement sent July 17, 2011, President Obama called Mandela "a beacon for the global community."

On their first solo trip to Africa, U.S. first lady Michelle Obama and her daughters, Malia, left, and Sasha, visit former President Nelson Mandela at his home in Houghton.