MEXICO CITY — Completing a partial recount nearly a week after Mexicans went to the polls, election officials on Friday confirmed thatEnrique Peña Nieto had won the nation’s presidential election.
Mr. Peña Nieto, the candidate of the Institutional Revolutionary Party, or PRI, won 38 percent of the vote, with the leftist candidate, Andrés Manuel López Obrador, receiving 32 percent. Josefina Vázquez Mota, of the conservative party, got 25 percent.
The final results were in line with the preliminary count reported shortly after polls closed on Sunday, but Mr. López Obrador, who in 2006 lost by a sliver to the current president, Felipe Calderón, is claiming fraud, citing news media and social media reports of vote-buying, and calling for a total recount.
“More and more, we have elements that support the hypothesis that the presidential election was bought by those who do not want change in our country,” Mr. López Obrador said Friday.
During a news conference he held Thursday, the lectern was covered with prepaid gift cards that he said PRI supporters had handed out to voters to secure their votes.
Mr. López Obrador will have until Thursday to submit a formal complaint to the Federal Electoral Tribunal, which has the power to annul federal elections, though it has never done so.
In addition to the accusations by Mr. López Obrador and his Party of the Democratic Revolution, young people protested on the streets of Mexico City on Monday. “We demand that it be recognized that there was a fraud,” said Gael Aguilar, 20, one of the students chanting anti-Peña Nieto slogans during the march.
The students said they were planning a “national megamarch” on Saturday.
Several videos purporting to show shoppers using gift cards like the ones that were displayed on Mr. López Obrador’s lectern have begun circulating on YouTube. PRI officials dismissed the accusations as a farce orchestrated by Mr. López Obrador and his supporters and threatened to report the matter to the attorney general.
Mr. Peña Nieto’s victory signals the return of the autocratic PRI, which governed Mexicofor 71 years, until 2000. But it was not the resounding victory that polls had predicted in the months leading up to the election, some of which had forecast a 15-percentage-point margin.