Lopez Obrador, presidential candidate for the PRD, delivers a speech during a rally in Puebla

 
Lopez Obrador, presidential candidate for the PRD, delivers a speech during a rally in Puebla
Andres Manuel Lopez Obrador, presidential candidate for the Party of the Democratic Revolution (PRD), delivers a speech during a rally in Puebla June 16, 2012. Support for Mexico's presidential frontrunner Enrique Pena Nieto edged higher and his lead over leftist rival Lopez Obrador widened after a weekend presidential debate, a new opinion poll showed on Thursday. REUTERS/Imelda Medina (MEXICO - Tags: POLITICS ELECTIONS)