The Institutional Revolutionary Party loosened its rules on Wednesday, granting President Enrique Pena Nieto more power to pick his own candidate.
Support for President Pena Nieto’s Institutional Revolutionary Party stood at 17%, 11 percentage points behind the top choice, Lopez Obrador’s National Regeneration Movement.
The presidential candidate from the opposing party,Lopez Obrador, has challenged the validity of the votes, accusing the winning party of fraud.
Lenin Moreno’s victory will mean the continuation of his predecessor Rafael Correa’s inclusive agenda of development.
Lopez Obrador’s folksy brand of leftist, Mexico-first rhetoric has put the former Mexico City mayor out front in opinion polls for the 2018 presidential election.
The cancellation, which followed a Twitter war between the two leaders signals a souring of relations between US and one of its most important international partners.
Polls in Veracruz show the ruling party in a very tight race with Cuitlahuac Garcia, the candidate of the new leftist party and a joint ticket by the main centre-right and centre-left opposition parties.