Also known as "Ethnocide: Notes sur la région du Mezquital", this is a documentary produced by Mexico and Canada in a conjoined effort, directed by Paul Leduc. This video is an extract of it, presenting the election on 1976 in an area of the Mezquital, probably Ixmiquilpan, with then candidate José López-Portillo.
The whole documentary is arranged just as the alphabet is, with A being "antecedentes/antécédents", B being "burguesía/bourgeoisie", C being "clases/classes", and so on. So, this one present is scene D.
I highly advice looking for the complete documentary if you can speak Spanish or read French. And once again, God bless archive.org
All credit to its original authors. I just uploaded this to make some divulgation of the thing itself.
English subtitles coming soon.