President Barack Obama speaks at the Symposium on Global Agriculture and Food Security at the Chicago Council on Global Affairs, Friday, May 18, 2012, at the Ronald Reagan Building in Washington. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama speaks at the Symposium on Global Agriculture and Food Security at the Chicago Council on Global Affairs, Friday, May 18, 2012, at the Ronald Reagan Building in Washington. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama speaks at the Symposium on Global Agriculture and Food Security at the Chicago Council on Global Affairs, Friday, May 18, 2012, at the Ronald Reagan Building in Washington. (AP Photo/Pablo Martinez Monsivais)
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