So sexual pathology is a mental illness where you feel intense sexual attraction to generally weird and sometimes nonsexual things.
“All politics is sexual pathology” is a tongue in cheek analysis of how peoples’ relationship to politics funnily have a sexual connection. Think Ben Shapiro and AOC’s feet, the sexualization of Biden by liberals and Trump by conservatives, or how the fascist’s desire for an authoritarian government is really just their desire to be dommed by the state.
It’s a joke and hyperbolic for the sake of comedy, but it still exists. We use it to dunk on conservatives, but I think it even happens for leftists. Communists have made Lenin fancams, there’s that picture of hot Stalin, and I personally think being a communist is an attractive trait in a partner.