I'd guess you wouldn't be a fan of Jimmy Carr's.
I think the guy's brilliant myself. But he is absolutely vicious in skewering pretty much anybody and everybody. That said, I don't think politicians would be wise to invite Jimmy to a rally. That would seem likely to backfire.
I just find it kind of a social curiosity that our reactions to these sorts of things have a lot to do with the context in which they're delivered. The jokes this guy is getting heat for today would be considered mild in a traditional standup context. And I honestly don't think much (if any) of the outrage is genuine....it's the manufactured type, designed to induce favorable political movement.
In fact, I'd say that about virtually all outrage in the political realm. I'd say it about the "Nazi Rally" thing, too. Few people are actually this easily offended.