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Associated Press
In this Tuesday, May 7, 2013 photo, Iranian President elect, Hasan Rouhani, a former Iran's top nuclear negotiator, smiles, as he registers his name for the candidacy of the presidential election, at the interior ministry, in Tehran, Iran. Just a week before Iran's election gatekeepers announced the presidential ballot, Rouhani described the U.S. as the world's "sheriff" and said direct talks with Washington are the only way for breakthroughs in the nuclear standoff. (AP Photo/Vahid Salemi)

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