FILE - Former U.S. President Jimmy Carter, left, speaks with Ethiopian President Mengistu Haile Mariam in Addis Ababa, July 11, 1990, during the 26th summit of the Organization of African Unity. (AP Photo/Aris Saris, File)

FILE - U.S. President Jimmy Carter reviews honor guards during arrival ceremonies at the Dodan Barracks in Lagos, Nigeria, April 1, 1978. (AP Photo, File)

FILE - Former U.S. President Jimmy Carter helps in the contruction of a low-income housing project in Durban, South Africa, June 6, 2002. Carter was among 4,500 volunteers, organized by Habitat for Humanity, building 100 homes in the coastal city during the week. (AP Photo/Themba Hadebe, File)

FILE - A girl holds a portrait of U.S. President Jimmy Carter in a market in Lagos, Nigeria, March 31, 1978, the day of his arrival for a state visit, the first to Africa by an American president. (AP Photo/Dieter Endlicher, File)

FILE - President Jimmy Carter meets with Zimbabwean Prime Minister Robert Mugabe in the Oval Office of the White House in Washington, Aug. 27, 1980. (AP Photo/Barry Thumma, File)

FILE - Former U.S. President Jimmy Carter, right, greets Southern Sudanese men waiting to cast their vote at a polling station in Juba, Southern Sudan, Jan 9, 2011, during a weeklong referendum on independence that is expected to split Africa's largest nation in two. (AP Photo/Jerome Delay, File)

FILE - Former South African President Nelson Mandela, left, and former U.S. President Jimmy Carter, right, hold HIV-positive babies at the Zola Clinic in Soweto, March 7, 2002. (AP Photo/Nonthemba Kwela, File)