Presidential candidate Enrique Pena Nieto, of the Revolutionary Institutional Party (PRI), poses for a photo with a woman during a campaign event with women in Guadalajara, Mexico, Friday March 30, 2012. The four candidates for Mexico's presidency officially launched their campaigns for the July 1 election on Friday, all of them promising change.  (AP Photo/Bruno Gonzalez) Photo: Bruno Gonzalez, Associated Press / AP