 For the six-year term that Obregón was to serve, three presidents held office, Emilio Portes Gil, Pascual Ortiz Rubio, and Abelardo L. Rodríguez, with Calles the power behind the presidency.In 1934, the PNR chose Calles-supporter Lázaro Cárdenas, a revolutionary general, who had a political power base in Michoacan, as the candidate of the PNR for the Mexican presidency.After an initial period of acquiescence to Calles's role intervening in the presidency, Cárdenas out-maneuvered his former patron and eventually sent him into exile.