http://www.youtube.com/watch?v=pQtSTtjxllc&feature=endscreen&NR=1
Joe Wong's funny, insightful, talks about American identity throws a couple shots at Obama and Biden (clearly for humor), and is generally pretty likeable all around.
I bring him up because I can't help but think that, in light of Pete Hoekstra's ad, Limbaugh's racism when attacking Hu Jintao, some of the racial criticisms leveled at Obama's choice of Dr. Jim Young Kim to be our nominee for the the World Bank, this guy would never be called on for a similar Republican speaking engagement.
And that's when I think to myself, "Yeah, that's one reason why people pick on the Republican party." Not even counting Wong's personal politics, he's simply too much of an other. "Go back to your country!" and "Learn to speak English!" is not productive in any way, nor are they things that the moderate-minority of the Republican party would say, I think.
That's not to say Democrats aren't immune to making racist remarks, either, but one party not only does it louder, but much, much more often. And even then, it's not moderate Republicans saying these things most of the time, the guilty ones are right-wing extremists. But when the extremists make such a quote, Republicans will rarely be the first to call them out on that, because the extremists have such an intense grip on the party.
The OP said not to include talk shows, but I'd have to bring up Jon Stewart and Stephen Colbert. Stewart has tended to get along with or occasionally praise people like Scott Brown (post-election) and Olympia Snowe not because of politics, but for backing up their positions with more than just shouting out catchphrases, and Huckabee and McCain used to be frequent guests (pre 2008 primaries, of course). For Colbert, politicans tend to see the "Colbert Bump," a spike in their approval ratings regardless of party after appearing on the show (so yes, a few Republican politicians have benefited from that -- like Huckabee again).
So in my mind, it's not that Republicans get satirized more, but rather that shouty, loud-mouthed, all-flash-no-substance Republicans become the target of satire, because what they say is far less nuanced and therefore much easier to duplicate and thus twist around. Moderate Republicans tend to be unscathed. Those dependent on soundbytes and slogans (Dubya being a huge example -- he seemingly had a new term every other week!) are gonna get trashed.