PRI's national leader, Roberto Madrazo, in his quest to be the party's candidate in 2006.
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Mr Madrazo had backed last month's vote in Congress to lift the mayor's immunity from prosecution.
Mr Madrazo, the party's former president, faces a strong challenge from Arturo Montiel, the ex-governor of Mexico state.
Such suspicions resurfaced this year, when Mr Madrazo revealed his presidential ambitions with a series of television spots.
The fine showed that government regulators are becoming more aggressive after years of timid oversight, according to Mr. Madrazo.
She supported Mr Fox's efforts to persuade Congress to approve economic reforms against the opposition of Mr Madrazo's followers.
Were this to be Mr Madrazo, some believe he might leave the party.
Roberto Madrazo, the probable presidential candidate of the Institutional Revolutionary Party (PRI), won a bitter election to become Tabasco's governor in 1994.
He invited both Mr Bartlett and Mr Madrazo for coffee last week.
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But the suspicion that his rival's campaign dug up the documents hurt Mr Madrazo, who has a history of winning elections in controversial fashion.
Victory in Tabasco, the old way, would have boosted their message of taking the party back to its origins, with Mr Madrazo at the helm.
Mr Madrazo is now likely to continue his drive to marginalise the more liberal wing of his party, headed by Elba Esther Gordillo, the teachers' union leader.
But that propaganda, managed by the publicist for Mr Zedillo's own presidential campaign, helped to put the cheeky and charismatic Mr Madrazo ahead of the stiff Mr Labastida.
The primary had a clear winner: with over half the votes, Francisco Labastida, a former interior minister, was well ahead of his chief rival, Roberto Madrazo, a maverick former state governor.
To boost his credentials as a democrat, in 1995 Mr Zedillo tried and failed to get Mr Madrazo to resign his governorship after allegations that too much money, and of dubious origin, had financed his campaign.
Mariano Fortuny y Madrazo (1871-1949) was Spanish.
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But Mr Labastida trails in most opinion polls, and faces a powerful challenge from traditionalists, such as Roberto Madrazo, the governor of Tabasco state, who has led two recent polls, and Manuel Bartlett, until recently the governor of Puebla.
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