Mexico opposition targets governor's race that would 'prove president's failure'

Morena party leader Andri(C)s Manuel Lopez Obrador campaigns in Mexico state in hopes of historic victory that could seal Enrique Pena Nieto's fate

The crowd cheers as a mariachi band belts out a song dedicated to Andri(C)s Manuel Lopez Obrador, leader of Mexico's National Regeneration party (Morena), while he poses for selfies with jostling supporters in front of the stage.

The gathering feels more like a party - complete with cake, flowers and the faint smell of alcohol and marijuana - rather than a midsize political rally on the home turf of President Enrique Pena Nieto and one of the most powerful factions of the governing Institutional Revolutionary Party (PRI).