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Obama heads to Africa amid Mandela gloom

US President Barack Obama speaks at Georgetown University in Washington on June 25, 2013. Obama heads to Africa on a long awaited first major tour Wednesday at a poignant moment, just as the world prepares to bid a reluctant farewell to Nelson Mandela.US President Barack Obama on Wednesday embarked on his first major tour of Africa that comes at a poignant moment, just as the world prepares to bid a reluctant farewell to Nelson Mandela.