Associated Press
Presidential candidate Andres Manuel Lopez Obrador of the Democratic Revolution Party (PRD) leaves the podium after speaking in Mexico City, Sunday, July 1, 2012. Obrador said he won't concede the presidency despite an official preliminary count that shows him losing to former ruling party candidate Enrique Pena Nieto, of the Institutional Revolutionary Party (PRI), and that he would wait for a full count. (AP Photo/Eduardo Verdugo)

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