if signature campaigns dedicated to mixers are prohibited on the forum, then similar joke (or not) campaigns of politicians also have no place on the forum.
Please elaborate 
This is just my subjective vision (which doesn't necessarily have to coincide with the opinion of those reading this post) of this situation, which can be voiced as "personally, I don't like these Trump\Kamala ssignature campaigns", because they do not carry any useful semantic load.
Banning mixers from the forum had a reason:
These two phrases, when placed side by side, make me think that the US did influence the fate of the mixers on this forum. But this is not a darknet forum, and with mixers looking "grayer and grayer"
Discussing or even making fun of public figures is, as far as I know, allowed in the US.