I haven't see a single second of the three television shows you list, so I can't comment. However, I was a fanatical reader of
Mad for many years. (In fact, I own a set of CD ROM's that has every issue of
Mad from the very first one, back when it was still a comic book in the 1950's, up to the late 1990's. I have read every single page of it, so I can speak with some authority -- if being an expert in trash makes me an authority.

)
Totally MAD CD ROM SetAnyway, it's fairly clear that the Usual Gang of Idiots was willing to make fun of
anybody. I can remember when they ran two great articles with titles something like "MAD Interviews the Conservative of the Year" and "MAD Interviews the Liberal of the Year." Both sides were mercilessly mocked. Of course, much of
Mad had nothing to do with politics, from the insane slapstick of Don Martin to the spoofs of popular movies and TV shows. Overall, I would have to say that the political philosophy of
Mad was strongly libertarian and moderately liberal. Certainly they were anti-Communist ("Spy Vs. Spy" creator Antonio Prohias having escaped Castro's Cuba.) Socially, they were pretty moderate, being somewhat iffy on feminism and gay rights, and strongly against drug abuse and smoking.
Here's an interesting article from a Christian point of view:
The MAD Morality