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Obama heads to Tanzania on last leg of Africa tour

US President Barack Obama walks through the former prison yard on Robben Island where South-African anti-apartheid activist Nelson Mandela, was once jailed, on June 30, 2013. Obama heads to Tanzania Monday, on the last leg of an African tour in which aili President Barack Obama heads to Tanzania Monday, on the last leg of an African tour in which ailing Nelson Mandela's offstage presence complicated a key US diplomatic push in a rising continent.