President Andrés Manuel López Obrador's party, Morena, lost seats in the Chamber of Deputies.
It went from having 256 deputies (out of 500), to having between 190 and 203, according to preliminary data from the National Electoral Institute (INE).
However, in alliance with the Labor Party (PT) and the Green Ecologist (PVEM), Morena reached a simple majority -that is, more than 250-, with between 255 and 292 deputies.
AMLO will find it difficult to undertake reforms to the Constitution, whose approval requires two-thirds of the deputies, that is, 334 seats.
For its part, the opposition, represented in the National Action Party (PAN), Institutional Revolutionary Party (PRI) and Democratic Revolution (PRD) obtained between 181 and 213 deputations as a coalition.
These are the keys to these intermediate elections:
Historical participation
According to the president of the National Electoral Institute, Lorenzo Córdova, there was a participation of between 51.7% and 52.5%.
This represents the largest turnout in a midterm election in more than 20 years (since 1997).
Officials are counting votes at a polling station in Guadalajara, Jalisco state, on Sunday.
EFE / Francisco Guasco
Morena sum in new states
The other great contest of the day was played in 15 of the 32 state governments of the country.
The projections of the Electoral Institute give Morena the victory in states such as
Baja California Sur, Colima, Guerrero, Tlaxcala, Sinaloa, Sonora, Nayarit and Zacatecas.
Guerrero garnered great prominence during the campaign, since Morena had to withdraw his candidate, Félix Salgado Macedonio, accused of rape, for irregularities, and replaced him with his daughter, Evelyn Salgado.
The electoral authority also projected that the opposition alliance retained the conservative states of Campeche and Chihuahua and that the Green Party won San Luis Potosí, while Baja California, Michoacán and Campeche remain in dispute.
In addition, Samuel García (MC) prevailed in the industrialized Nuevo León, the most populated state of those at stake and the jewel in the crown of these elections.
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If the results are confirmed,
Morena will replace the PRI as the party that controls the most territories
, together with those it already has under its power: Mexico City, Puebla, Chiapas, Veracruz and Tabasco.
Morena loses strength in the capital
The president's party lost six mayors of the Mexican capital.
AMLO referendum
Even without López Obrador on the ballot, the midterm elections were seen by many as a referendum on his government and its ability to continue what he calls Mexico's "Fourth Transformation" six months before it reaches midterm.
Elections marked by violence
After experiencing the most violent electoral campaign in its history, Mexicans voted this Sunday in a climate of almost total normality, with the exception of some isolated incidents and the omnipresent COVID-19 pandemic, for which the use of a mask was mandatory.
According to the electoral authorities, more than 99% of the almost 163,000 voting points throughout the country could be installed normally.
The election was preceded by a violent campaign with the presence of organized crime that left more than 910 attacks against politicians, surpassing the 2018 record, and 91 were assassinated, 36 of whom were candidates.
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Despite some gruesome events this Sunday, such as the launching of two human heads in schools in Tijuana, the OAS observer mission declared that no "serious incidents" were detected that would compromise the election and its results.
The biggest elections
This Sunday's midterm elections are considered the largest in the country's history, in which more than 20,500 positions were elected.
With information from Efe and AP.