Associated Press
Supporters of Enrique Pena Nieto, presidential candidate for the Revolutionary Institutional Party (PRI) celebrate at party headquarters as exit polls begin to come in for general elections in Mexico City, Mexico, Sunday, July 1, 2012. Mexico's federal elections institute's preliminary count says Enrique Pena Nieto has won the presidency. The candidate for the old-ruling Institutional Revolutionary Party, or PRI, has won about 38 percent of the vote according a representative count of the ballots.  (AP Photo/Alexandre Meneghini)

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