A late-night official count forecast that leftist Andres Manuel Lopez Obrador would win at least 53 percent of the vote, a margin not seen in the country for many years. His rivals have conceded defeat.
Of the four candidates in Sunday's election, Andres Manuel Lopez Obrador who is the leader of the National Regeneration Movement or MORENA has emerged as the frontrunner in most polls.
Leading by more than 20 points in the polls Andres Manuel Lopez Obrador has successfully tapped voters' anger with a seemingly never-ending series of corruption scandals and horrific violence that left a record 25,000 murders last year.
Mexico's second presidential debate ended with a weak showing from the leading candidate. While leftist Andres Manuel Lopez Obrador still has a lead of 20 percentage points, other candidates could be allying to stop his advance.
The survey by polling firm Consulta Mitofsky showed Andres Manuel Lopez Obrador, running for the third time, had 32.6 percent of support, up from 31.9 percent in April.
Mexicans go to the polls on July 1 for a presidential election. Candidates kicked off a three-month race on Friday, promising to reform the corrupt politics that have plagued the country.
Mexican President Pena Nieto is being challenged from the right and the left, and with rampant crime and corruption laid at his feet, the Mexican elections are ripe for newcomers.
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