Mexico's leftist presidential hopeful Andres Manuel Lopez Obrador
Mexico's leftist presidential hopeful Andres Manuel Lopez Obrador of the Party of the Democratic Revolution (PRD) waves during a rally in the town of Motul, in this January 7, 2012 file picture. Lopez Obrador has pledged to break up Mexico's "monopolies" and press foreign mining firms for higher taxes and better wages if elected on July 1, 2012. Lopez Obrador, often vilified by opponents as a threat to private enterprise, said wresting control of large sections of industry from just a few hands was vital to revitalizing the economy. REUTERS/Victor Ruiz Garcia/Files