political
PPS and PARM — PRI's Controlled Opposition
The 1964 elections saw the PPS (Partido Popular Socialista) and PARM (Partido Auténtico de la Revolución Mexicana) participate as satellite parties that endorsed the PRI candidate. These 'loyal opposition' parties received congressional seats via a 1963 proportional representation law but posed no genuine challenge. This system of controlled opposition maintained democratic appearances while ensuring PRI dominance.
Sources
- T3 Juan Molinar Horcasitas, El tiempo de la legitimidad, Cal y Arena Institutional
- T1 Comisión Federal Electoral records Official