Mexico's Institutional Revolution Party, or PRI (Partido Revolucionario Institucional), opposed the classic electoral authoritarian regime, which was supported by the Partido Acción Nacional (PAN), or National Action Party.

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This statement is incorrect. The PRI is known for its long history of being the dominant party in Mexico's classic electoral authoritarian regime, while the PAN has historically been the opposition party.

Mexico's Institutional Revolution Party, or PRI (Partido Revolucionario Institucional), Opposed