MEXICO CITY, Sept 5 (Reuters) – Former Mexico City Mayor Claudia Sheinbaum held a comfortable advantage in the race to be the leftist ruling party’s 2024 presidential nominee, according to an opinion poll published on Tuesday, the eve of the announcement of the winner.

A telephone survey published by newspaper El Financiero, using the same methodology chosen by the ruling National Regeneration Movement (MORENA) to select its candidate, put Sheinbaum at 36% support, followed by former Foreign Minister Marcelo Ebrard at 25%.

The Sept. 1-2 survey polled 500 Mexican adults and had a margin of error of plus or minus 4.4 percentage points. Sheinbaum’s advantage was wider than the seven-point lead she held in an El Financiero poll conducted July 28-29.

MORENA will on Wednesday announce who will be its candidate to succeed President Andres Manuel Lopez Obrador, based on national polling over the past week that gives a 75% weighting to the question of who is the preferred choice.

The remaining 25% is determined by the public’s perception of how contenders score on five questions relating to their honesty, proximity to the people, knowledge of the country, whether they keep their word, and how favorably they are viewed.

Sheinbaum was clearly ahead on all of the supplementary questions except for her knowledge of the country, where the experienced Ebrard narrowly beat her, El Financiero said.

Ebrard has raised concerns about the way in which the poll has been conducted, and did so again on Monday evening.

Sheinbaum, a close ally of Lopez Obrador, has been viewed for months as the one to beat. The popular Lopez Obrador cannot seek a second six-year term because Mexican law prohibits it.