Beneath this morning’s Mexico planting, Ed, and later Manuel, have provided preliminary seat counts. If the results hold, the PRI and Greens together may have a majority.
They ran in a partial pre-electoral coalition: joint candidates in 63 districts, but separate lists (and candidates elsewhere).
The coalition apparently has won in 50 districts, which is impressive.
Also noteworthy is that the Mexican Green Party, at 6.5% of the votes in this election, would suddenly find itself among the largest Green parties in the world. I did not see that coming. (I will leave it to others to decide whether a Green alliance with a party like the PRI is anything to celebrate.)
What I am unsure of is the extent to which the PRI and Greens have been cooperating in congress and whether they have anything like a commitment to cooperate in the upcoming congress. If they do, then I would be inclined to put this election into the relatively rare category of those in (pure) presidential systems that produce divided government.