| http://www.w3.org/ns/prov#value | - 005, when the former South African president was in Washington, and Obama was a newly elected senator, and the two have spoken several times since by telephone.But there has been no face-to-face meeting between them since Obama was elected in 2008.During his trip, Obama was also due to host a town hall meeting at the University of Johannesburg's campus in Soweto, the township where Mandela once li
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