Mexican President Andres Manuel Lopez Obrador (L, Front) shows his credential before casting his ballot during the mid-term elections in Mexico City, capital of Mexico, on June 6, 2021. Mexico began midterm elections on Sunday with the opening of about 161,000 polling stations throughout the country, with about 90 million people eligible to vote to fill more than 20,000 public positions. (Str/Xinhua)

A woman, who received both doses of the Sinovac COVID-19 vaccine, waits to cast her ballot at a polling station during the mid-term elections in Ecatepec, Mexico, on June 6, 2021. Mexico's mid-term elections kicked off on Sunday, with tens of thousands of candidates vying to fill more than 20,000 public posts. (Xinhua/David de la Paz)

Mexican President Andres Manuel Lopez Obrador (Front) casts his ballot during the mid-term elections in Mexico City, capital of Mexico, on June 6, 2021. Mexico began midterm elections on Sunday with the opening of about 161,000 polling stations throughout the country, with about 90 million people eligible to vote to fill more than 20,000 public positions. (Str/Xinhua)

Mexican President Andres Manuel Lopez Obrador (R, Front) has his finger inked after casting his ballot during the mid-term elections in Mexico City, capital of Mexico, on June 6, 2021. Mexico began midterm elections on Sunday with the opening of about 161,000 polling stations throughout the country, with about 90 million people eligible to vote to fill more than 20,000 public positions. (Str/Xinhua)

A woman casts her ballot during the mid-term elections at a polling station in Ecatepec, Mexico, on June 6, 2021. Mexico began midterm elections on Sunday with the opening of about 161,000 polling stations throughout the country, with about 90 million people eligible to vote to fill more than 20,000 public positions. (Xinhua/David de la Paz)

Mexican President Andres Manuel Lopez Obrador (Front) shows his inked finger after casting his ballot during the mid-term elections in Mexico City, capital of Mexico, on June 6, 2021. Mexico began midterm elections on Sunday with the opening of about 161,000 polling stations throughout the country, with about 90 million people eligible to vote to fill more than 20,000 public positions. (Str/Xinhua)

People fill in ballots at a polling station during the mid-term elections in Mexico City, Mexico, on June 6, 2021. Mexico began midterm elections on Sunday with the opening of about 161,000 polling stations throughout the country, with about 90 million people eligible to vote to fill more than 20,000 public positions. (Photo by Luis Licona/Xinhua)