Former Nigerian President Olusegun Obasanjo has hailed the late ex-U.S. President Jimmy Carter as a “humanist par excellence” and the only non-African leader who personally visited General Sani Abacha to plead for his release from prison. Obasanjo, who served as Nigeria’s military Head of State from 1976 to 1979 and later as a two-term civilian president from 1999 to 2007, …