Andres Manuel Lopez Obrador, presidential candidate for the Democratic Revolution Party (PRD), waves during a news conference in Mexico City, Thursday, July 12, 2012. Lopez Obrador says he will ask an... more 
Andres Manuel Lopez Obrador, presidential candidate for the Democratic Revolution Party (PRD), waves during a news conference in Mexico City, Thursday, July 12, 2012. Lopez Obrador says he will ask an electoral court to invalidate the results of the July 1 presidential election, charging there was vote buying and campaign overspending by the winner of official vote counts. (AP Photo/Eduardo Verdugo) less 
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Associated Press | Photo By Eduardo Verdugo
Fri, Jul 13, 2012 10:05 AM EDT