Andres Manuel Lopez Obrador, presidential candidate for the Democratic Revolution Party (PRD), speaks during a news conference in Mexico City, Friday, Aug. 31, 2012. Lopez Obrador said Friday that he is refusing to recognize the results of Mexico's presidential election, raising the question of whether he will launch street protests like those he used to paralyze central Mexico City after losing the 2006 vote. (AP Photo/Alexandre Meneghini)

Associated Press
Andres Manuel Lopez Obrador, presidential candidate for the Democratic Revolution Party (PRD), speaks during a news conference in Mexico City, Friday, Aug. 31, 2012. Lopez Obrador said Friday that he is refusing to recognize the results of Mexico's presidential election, raising the question of whether he will launch street protests like those he used to paralyze central Mexico City after losing the 2006 vote. (AP Photo/Alexandre Meneghini)
Andres Manuel Lopez Obrador, presidential candidate for the Democratic Revolution Party (PRD), speaks during a news conference in Mexico City, Friday, Aug. 31, 2012. Lopez Obrador said Friday that he is refusing to recognize the results of Mexico's presidential election, raising the question of whether he will launch street protests like those he used to paralyze central Mexico City after losing the 2006 vote. (AP Photo/Alexandre Meneghini)
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