Democratic Revolutionary Party
Politicians who split away from the PRI formed the center-left Democratic Revolutionary Party in 1988, after leader Cuauhtemoc Cardenas Solorzano made an independent run at the presidency. The faithful still claim he won.
The PRD currently holds seven Senate seats and 65 Chamber of Deputies seats, but no state governors' chairs.
The left-leaning party, along with many around the globe, is trying to modernize its image to reflect market trends. The party once opposed the North American Free Trade Agreement now suggests modifications to the trilateral pact.
But it still criticizes privatization, and the connection is genetic: it was Cardenas' father, President Lazaro Cardenas, who nationalized Mexico's oil industry in the 1930s.
Cardenas, who also ran for president in 1994 and is considered a potential contender in 2000, is appealing to voters as a candidate in Mexico City with talk of cleaning up corrupt law enforcement and pushing for more social spending.
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