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.

"We are going to wait until we have definitive results," he said. "We are not going to act in an irresponsible way. At the right time we will inform the people of Mexico."

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.

[AP]