Enrique Pena Nieto, presidential candidate of the Institutional Revolutionary Party (PRI), gives a speech after exit polls showed him in first place, in Mexico City July 1, 2012. The party that ruled Mexico for most of the 20th century claimed victory in a presidential election on Sunday as a senior election official said the party's candidate, Pena Nieto, held an irreversible lead over his rivals. The words on the podium read, "Mexico win". REUTERS/Tomas Bravo (MEXICO - Tags: POLITICS ELECTIONS)