While we all no there's no shortage of ham-fisted political cartoons in the funny pages, I think the worst examples of these are the ones that use children as their main characters. The most notorious among them being Scott Stantis' "Prickly City" on the right and John Hambrock's "The Brilliant Mind of Edison Lee" on the left as both feature a pre-adolescent one-dimensional mouthpiece as a main character.
For alleged children, Carmen from "Prickly City" and the eponymous Edison Lee really aren't particularly childlike at all. One could argue that they are precocious, but even precocious kids from comics past like Calvin from "Calvin & Hobbes" and the kids from "Bloom County" showed their child side with much more frequency. They aren't even much as alleged characters either. Politics aside, Carmen comes off as a heartless jerk and a scold while Edison is a conniving twerp that creates some deus-ex-machina invention for whatever problem that's ripped from the headlines. It boggles my mind why their artists couldn't have just made them adults.
Though I must give "Prickly City" some credit. Despite it's shortcomings as a strip, it's probably the best conservative political strip in the papers. It has story arcs, the occasional non-political strip, and sometimes takes shots at its own side (unlike that certain strip with a duck). However there is still room for much, much more improvement.
P.S. Did I draw James Lipton okay? Could you tell that was him?