Lawmakers from the party of leftist leader Andres Manuel Lopez Obrador tried to block the ceremony.
His opponent, Andres Manuel Lopez Obrador, has dismissed the claim of victory, alleging irregularities in the vote count.
The populist candidate, the Democratic Revolutionary Party of Andres Manuel Lopez Obrador, claims that irregularities skewed the race.
Andres Manuel Lopez Obrador strides onto the stage in a white button-down shirt, the collar open, his pose relaxed.
His rival, leftist politician Andres Manuel Lopez Obredor, garnered 31% of the vote.
FORBES: Protest in Mexico Seeks to Overturn Election Results
Mr. ANDRES MANUEL LOPEZ OBRADOR: (Through translator) We will defend the right of the people to freely choose their leaders.
Next Sunday Mexico will elect a new president, the race close between leftist Andres Manuel Lopez Obrador and conservative Felipe Calderon.
GARCIA-NAVARRO: There is very little doubt, Renee, that Andres Manuel Lopez Obrador's people have already conceded defeat in a press conference yesterday.
Andres Manuel Lopez Obrador of the Democratic Revolution Party (PRD) ranked in second place in numerous polls leading up to the election.
Well, I have to say, Andres Manuel Lopez Obrador was always expected to bring out a big crowd, and he has indeed done it.
He seemed to be following the example of Manuel Lopez Obrador of Mexico and was an attempt to de-legitimize the system and create an alternative power.
In the first of a series of profiles on the top candidates, NPR's Lourdes Garcia-Navarro sent this report on the current frontrunner, Andres Manuel Lopez Obrador.
PRD, this means its handful of governors, chief among them Andres Manuel Lopez Obrador, Mexico city's mayor, who is Mr Cardenas's chief rival in the party.
GARCIA-NAVARRO: Andres Manuel Lopez-Obrador swore himself in as the, quote, "legitimate president of Mexico" yesterday in a ceremony on the Zocalo, the main square in Mexico City.
NPR: Mexico's Obrador Vows to Continue Fighting for the Presidency
Felipe Calderon got more votes than Andres Manuel Lopez Obrador in the election, but it was a tiny margin of victory - 244, 000 votes separated the two candidates.
So perhaps it is a sign of the gravity of Mexico city's crime epidemic that Andres Manuel Lopez Obrador, its populist left-wing mayor, has turned to Rudolph Giuliani.
More than four months after an election that he officially lost, leftist leader Andres Manuel Lopez-Obrador says he won, and yesterday he declared himself the legitimate president of Mexico.
NPR: Mexico's Obrador Vows to Continue Fighting for the Presidency
Andres Manuel Lopez Obrador was born in the state of Tabasco on November 13, 1953, the first son of shopkeeper parents and the eldest of what would be seven siblings.
What was happening yesterday is representatives from Andres Manuel Lopez Obrador's PRD party were objecting to practically every, you know, packet of votes that were coming in in heavily PAN areas.
The video targets the major presidential candidates -- Enrique Pena Nieto, Josefina Vazquez Mota and Andres Manuel Lopez Obrador -- and aims to raise awareness about Our Mexico of the Future.
GARCIA-NAVARRO: You wouldn't know it to look at the main Mexican news programs who only covered Calderon, but tens of thousands of Andres Manuel Lopez Obrador supporters took to the streets today.
Mexico has been in turmoil since the July 2nd election, with the candidate from the left - Andres Manuel Lopez Obrador - charging that massive fraud gave his rival, Felipe Calderon, the lead.
The convictions of Jose Manuel Garcia Yeres and Hector Palomino Lopez fell far short of what prosecutors were seeking, reports the BBC's Gideon Long in Chile.
CNN's Mariano Castillo in Atlanta, Rey Rodriguez in Mexico City, Jose Manuel Rodriguez in Buenos Aires and Juan Carlos Lopez in Washington contributed to this report.
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