Nieto's PRI party -- the very party that nationalized Mexican oil 80 years ago -- is expected to vote this weekend to approve the new policy.
Some Mexicans seem willing to believe that this is not their father's PRI and that the party of today bears no resemblance to the one that was run from office a dozen years ago.
Vicente Fox's victory in 2000 ended the PRI's reign, but vestiges of the old system remain.
The radio report was first broadcast on PRI's The World on October 26, 2011.
PRI's approach to foreign policy, Mexico's diplomatic service lacks the professionalism of, say, Brazil's.
PRI's national leader, Roberto Madrazo, in his quest to be the party's candidate in 2006.
ECONOMIST: Something for everyone in an important state election
PRI's efforts to woo young voters, who shunned it in the presidential election, are equally haphazard.
ECONOMIST: Mexico's former ruling party reverses its losing streak
The radio report was first broadcast on PRI's The World on November 2, 2011.
PRI's presidential nomination in 2000, campaigning as an outsider against the party establishment in Mexico city.
Will he use unions as coercion arms as the PRI's political machine did in the past?
PRI's new leader in the lower house of Congress and a pragmatist who gets on well with Mr Fox.
That year in July, Carlos Salinas de Gortari, the PRI's candidate, won the presidency in one of the most controversial elections in Mexican history.
Listen to more on this story at PRI's The World, a co-production of the BBC World Service, Public Radio International, and WGBH in Boston.
O'BOYLE: The independent IFE has been trying to fight such tactics since it was founded in the '90s to replace the PRI's state-controlled electoral system.
PRI's first national primary election, in which 8m Mexicans voted last Sunday, marks an innovation, and another welcome step in Mexico's tortuous evolution to democracy.
PRI's presidential candidate in 2000 will be elected in a primary.
PRI's grip, many Mexicans will doubt that things have really changed.
PRI's adaptability, might seem to be strong arguments for Mr Labastida.
You can hear a radio version of this piece, at PRI's The World, a co-production of the BBC World Service, Public Radio International, and WGBH in Boston.
PRI's candidate: Mr Labastida was chosen by an open primary.
During the PRI's 12-year hiatus from presidency, its members firmly opposed such measures proposed by then-ruling National Action Party, arguing the country would lose sovereignty by allowing foreign investment in Pemex.
It will take many months, in some cases years, before Pena Nieto's reform agenda becomes law and produces its first results, plenty of time for big promises to be derailed by special interests, institutional inertia and the PRI's old guard.
PRI's confusion makes for strange bedfellows.
ECONOMIST: Mexico's former ruling party reverses its losing streak
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