A tally of returns released by Mexico 's Federal Election Institute last week confirmed that Pena Nieto of the Institutional Revolutionary Party , or PRI , received 38.21 % of the votes . Andres Enrique Pena Nieto is refusing to concede in the presidential election . He says he is filing a legal challenge because of allegations of vote-rigging . Election officials : Manuel Lopez Obrador won 31.59 % of the votes , to Manuel Lopez Obrador 38.21 % . The results remain unofficial until the country 's electoral tribunal ratifies them .
Andres Enrique Pena Nieto is refusing to concede in the presidential election . He says he is filing a legal challenge because of allegations of vote-rigging . Election officials : Manuel Lopez Obrador won 31.59 % of the votes , to Manuel Lopez Obrador 38.21 % . The results remain unofficial until the country 's electoral tribunal ratifies them .