President Barack Obama, wrapping up the first leg of an African tour this morning, said Washington had a “moral imperative” to help the world’s poorest continent feed itself and he then left for South Africa hoping to see ailing Nelson Mandela. White House officials hope Obama’s three-nation tour of Africa - his first substantial visit to the continent since taking office in 2009 - will compensate for what some view as years of neglect by America’s first black...
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