. US President Barack Obama (2nd L) speaks on June 28, 2013 with the head of the Senegalese Federation of Corn Producers, Nimna Diayte (2nd R), before USAID administrator Raj Shah (L) during an event on food security in Dakar. Obama flies to South Africa later on June 27 to pay homage to his former President Nelson Mandela, who is fighting for his life in hospital. JIM WATSON/AFP/Getty Images
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