Cárdenas and Muñoz Ledo created a pact in 1988 with the Mexican left in which the Mexican Socialist Party (whose candidate was Heberto Castillo) decided to support Cárdenas' candidacy as well. Also, the alliance with social organizations was obtained, like the Coalition of Workers, Peasants, and Students of the Isthmus (COCEI) (that had gained the local elections in Juchitán de Zaragoza), the Independent Central of Agricultural Workers and Peasants (CIOAC), the Assembly of Districts of the City of Mexico (created after 1985 earthquakes), the Union of Popular Colonies and the Revolutionary Union of Emiliano Zapata, among others. This agglomerate of civil parties and organizations they would be, along with the Democratic Current of the PRI, the base of future PRD.