Mr Lopez Obrador, from the oil-rich Gulf Coast state of Tabasco, held a commanding lead for the presidency of the 1.3-million-member left-wing party. It was founded in 1987 by an assortment of former communists, socialists and other left-wingers as well as several leaders of the ruling Institutional Revolutionary Party, who broke away to protest at corruption and repression. Mexico City - AP
The new head of Mexico's third strongest left-wing party is expected to be a pugnacious provincial leader who gained popularity by blockading state-owned oil wells and mobilising anti-government protests. Under Andres Lopez Obrador, the Democratic Revolutionary Party (PRD) is expected to challenge President Ernesto Zedillo to speed the pace of democratic reform or face more unrest.