A landmark decision, issued on 29 January 2014, was the first injunction for marriage recognition in Puebla.
The case involved a same-sex couple who legally married in Mexico City in 2012 and filed for spousal benefits with the Mexican Social Security Institute (IMSS) in the state of Puebla, but were denied.
Despite being passed four times by legislative commissions, the bill repeatedly got stuck in plenary voting for its sensitive nature, which could be attributed to the widespread opposition from right-wing groups and then-Head of Government Andrés Manuel López Obrador's ambiguity concerning the bill.
The law was well received by feminist and LGBT groups, including Emilio Álvarez Icaza, then-chairman of the Federal District's Human Rights Commission, who declared that "the law was not a threat to anyone in particular and that it will be a matter of time before it shows positive consequences for different social groups." It was strongly opposed by right-wing groups such as the National Parents' Union and the Roman Catholic Church, which labeled the assemblymen who voted for the law as "sinners" and complained it was "vengeance against the Catholic Church from the more radical groups from the left, who felt it was a demand for justice." In early September 2014, modifications to the Civil Union agreement were drafted to eliminate discrimination on the basis of sexual orientation and dissolution support.
Using international decisions, whose verdicts serve as legal precedent in Mexican courts, like the protections in the American Convention on Human Rights Karen Atala Riffo y Niñas v.
Chile case, 5 December 2012 that: 1) Laws limiting marriage to one man and one woman, or for the purposes of perpetuating the species, violated federal law requiring that they "correspond to all persons without any distinction" and 2) That such laws were unconstitutional on the basis of discrimination by sexual orientation and usurpation of the right, not only of the individual but also the couple's right, to form a family.
Chairman of the Committee on Constitutional Issues of the Chamber of Deputies, Daniel Ordoñez, announced in June 2016 that the president's initiative will be debated within the committee later in the year.
Ordoñez also said that 47,000 letters expressing opposition to the initiative were received though none of them were signed.
Being the seat of the Powers of the Union, Mexico City did not belong to any particular state but to all.
After years of demanding greater political autonomy, residents were given the right to directly elect the Head of Government of the Federal District and the representatives of the unicameral Legislative Assembly (ALDF) by popular vote in 1997.
Ever since, the center-left Party of the Democratic Revolution (PRD) has controlled both political powers.