Andres Manuel Lopez Obrador, who lost to Enrique Pena Nieto in last month's Mexican Presidential election, failed in his bid to overturn the poll results, as the country's highest electoral court dismissed his legal challenge against the outcome.
The Leftist presidential candidate had filed a legal complaint with the Independent Federal Electoral Institute (IFE), demanding nullification of the results of the Presidential vote held on July 1.
Obrador refused to admit defeat, accusing Institutional Revolutionary Party (PRI) candidate Nieto of violating electoral rules.
The 59-year-old former mayor of Mexico City accused PRI of buying "millions of votes" and campaign overspending.
He claimed that an investigation by the Leftist coalition found that most of the 143,000 ballot boxes used for the polling had "inconsistencies."
Following his request, almost half of the votes were recounted, and Nieto was confirmed the winner. The recounting showed an increase in Nieto's share of votes, with 38.21 percent that took away from Obrador's votes, which reduced marginally, with a final tally of 31.59 percent.
IFE submitted the complaints and the evidence to the Federal Electoral Tribunal after conducting an impartial investigation of Obrador's claim.
In its verdict on Thursday night, the seven-member Tribunal unanimously voted to dismiss the runner-up's accusations, ruling that he had not produced convincing evidence of wrongdoing. "There is no proof of vote-buying, there is no proof of coercion," said Justice Flavio Galvan Rivera.
The final verdict on the disputed election confirms that Nieto will be sworn in as Mexico's next President on December 1.
The decision sparked minor clashes between police and Obrador supporters, while Nieto called for working together for the unity and greatness of Mexico, saying that "it is time to start a new phase of work on Mexico's behalf."
Obrador, also known as AMLO or El Peje, has a history of swearing himself in as the "legitimate President of Mexico" after refusing to admit defeat at the hands of President Felipe Calderon in 2006.
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