Enrique Pena Nieto, top, presidential candidate for the Revolutionary Institutional Party (PRI) waves to supporters after casting his vote during general elections at a polling station in Atlacomulco, Mexico, 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/Esteban Felix)
July 1, 2012 8:36:40 PM PDT
E. EDUARDO CASTILLO Associated Press
MEXICO CITY (AP) - July 1, 2012 --
Presidential candidate Enrique Pena Nieto led Mexico's elections with about 40 percent of the vote, exit polls showed Sunday, signaling a return of his long-ruling party to power after a 12-year hiatus.