PRD Presidential Candidate Obrador Holds Final Campaign Rally In Mexico City

MEXICO CITY, MEXICO - JUNE 27: Presidential candidate Andres Manual Lopez Obrador of the leftist Party of Democratic Revolution (PRD) marches with supporters to his final campaign rally on June 27, 2012 in Mexico City, Mexico. Today is the final day of campaigning as Mexicans prepare to go to the polls to choose a new president on July 1. Lopez Obrador, of the leftist Party of Democratic Revolution, lost the last presidential election in 2006 by a small margin and never accepted the result, citing fraud. (Photo by John Moore/Getty Images)