Leftist candidate won't concede Mexico presidency

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Supporters of Enrique Pena Nieto, presidential candidate for the Revolutionary Institutional Party (PRI) gather at party headquarters as exit polls begin to come in for general elections in Mexico City, Mexico, Sunday, July 1, 2012. Pena Nieto is leading 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. (AP Photo/Alexandre Meneghini)

MEXICO CITY (AP) — Leftist candidate Andres Manuel Lopez Obrador says he won't concede the presidency despite an official preliminary count that shows him losing to former ruling party candidate Enrique Pena Nieto.

Lopez Obrador told his supporters that he would wait for a full count, and would act responsibly.

In 2006, Lopez Obrador took hundreds of thousands of supporters to Mexico City's streets when he narrowly lost the presidential election. It was feared he would try the same in this election and not accept the results. Pena Nieto's victory paves the way for Mexico's old Institutional Revolutionary Party, which ruled for 71 years, to return to the presidency for the first time since being voted out in 2000.