Mexico held a Congressional election on July 5, to fill all 500 seats. Although not all of the votes have been counted, it appears that the Green Party will have 25 seats in the new Congress, which takes office on September 1.
No party won a majority. The Institutional Revolutionary Party (PRI) has the most seats, 235. According to this article, it is possible the Greens will cooperate with the PRI to give that party a working majority (235 plus 25 equals 260, which is over half of 500). The National Action Party (PAN), the president’s party, has 153 seats. The Party of the Democratic Revolution (PRD) has 75 seats. That still leaves 12 seats to be accounted for. Mexico uses Proportional Representation.