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Associated Press
Mexican presidential candidate Andres Manuel Lopez Obrador of the Democratic Revolution Party (PRD)  shows his election ink-stained thumb after casting his vote at a polling station in Mexico City, Sunday, July 1, 2012. Mexico's more than 79 million voters head to the polls Sunday to elect a president, who serves one six-year term, as well as 500 congressional deputies and 128 senators. (AP Photo/Eduardo Verdugo)

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