The party that Cárdenas founded, the Partido de la Revolución Mexicana (PRM), established the basic structure of sectoral representation of important groups, a structure retained by its successor in 1946, the PRI. The PRI continued in power until 2000. This is attributed by some to electoral fraud and coercion. This legacy led his son, Cuauhtémoc Cárdenas, to form the Democratic Revolution Party (PRD) to contest the 1988 presidential election. Since that year, the PRD has become one of the three major parties in Mexico, gaining working class support that was previously enjoyed by the PRI.