How did Mexico p r i always managed to win election?

1.	How did Mexico p r i always managed to win election?
Answer» won every PRESIDENTIAL ELECTION from 1929 to 1982, by WELL over 70 percent of the vote—margins that were usually obtained by massive ELECTORAL frauds. ... In essence, given the PRI's overwhelming dominance, and its control of the electoral apparatus, the president chose his successor.

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