If the PAN and the PRD are sanctioned and the PRI is not, the Pact could suffer.
FORBES: Mexico Union Leader's Arrest Has Market Ready For Reforms
He outperformed most of the candidates running for the PRD in regional elections.
Police spokesman Maximo Baez said the security forces had retaken control of the PRD headquarters and would investigate the incident.
Lopez Obrador was mayor of the capital city from 2000 to 2005, and the city is a stronghold for the PRD.
Its social conservatism has limited its appeal in cosmopolitan Mexico City, where the mayor, the PRD's Marcelo Ebrard, has legalised gay adoption.
At first glance, it looks as if local leaders want to put the PRD in a better position to compete with Beijing and Shanghai.
The mood soured further when the PAN formed a brief electoral alliance with its ideological opposites, the PRD, to push the PRI out of some governorships.
Some Mexican historians still claim that another opposition candidate, Cuauhtemoc Cardenas from the PRD (the Party of the Democratic Revolution), was the real winner of those elections.
Regardless, after months of being out of the spotlight, the PRD is animated by this opportunity to improve its standing in spite of the internal dissent that still impedes its effectiveness.
Whereas the PRI is planning to field Beatriz Paredes, a well-known figure with close ties to her party's machine in the capital, the PRD has struggled to unite behind a strong candidate.
He says that Mexico's deep inequalities mean that the PRD cannot just be a moderate European centre-left party, but nor can it be so radical as to become a movement outside the country's institutions.
For 12 years, Mexico City has been governed by AMLO and his successor Marcelo Ebrard, both from the leftist PRD party.
Although the party has yet to prove it has the ability to beat the PLD in 2010 legislative elections, it is likely to benefit from the electorate's disenchantment and perhaps improve upon the 40% share of the vote that PRD candidate, Miguel Vargas Maldonado, received in the 2008 presidential election.
Andres Manuel Lopez Obrador of the Democratic Revolution Party (PRD) ranked in second place in numerous polls leading up to the election.
The opposition Partido Revolucionario Dominicano (PRD) has been able to capitalise on the situation by advocating on behalf of the healthcare employees, as well as teachers and military personnel.
Both are members of the Dominican Revolutionary Party, or PRD.
The PRI and PAN, and smaller Green Party voted in favor, while the leftist parties led by the Party of Democratic Revolution, or PRD, opposed it.
For that reason, many PRD leaders preferred Marcelo Ebrard, the moderate mayor of Mexico City.
PRD's Mr Cardenas has been slipping in the polls, thanks to his unimpressive running of Mexico city.
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