Admittedly, Asay is a tool even by conservative cartoonist standards. But on the whole, I find that most conservative cartoonists are just plain bad at their job. Asay, Wayne Stayskal (Tampa Tribune) and Brian Farrington (Arizona Republic) are typically the most egregious mainstream ones in that respect. Asay and Stayskal were the only two I know of with the temerity to defend the NRA in the immediate aftermath of Columbine and the Virginia Tech shootings.
Which isn't to say that all conservative cartoonists are bad, or that all liberal ones are good. Robert Arial (of The State, Columbia SC) is a conservative cartoonist whom I respect, even when I disagree with his characterization of things. There are certainly some liberal cartoonists with poor arts skills and/or a tendency to preach in the most shrill and hyperbolic tones. Kevin Kallaugher (at The Economist, who did the one Siquo posted) is neither. Dude's an awesome cartoonist, and I think it shows in this one. The Tea Party is, in fact, dictating GOP policy despite its relatively small representation in the GOP. The GOP is, in turn, dictating American fiscal policy despite being the minority party in government. American economic problems, despite being only 1/4 to 1/5 of the world economy, is dragging the world along with it. And with a vocal Tea Party caucus that was ready to drive the US off the cliff into default and argued that economist and other "so-called" experts didn't matter because Bachmann et. al. believed it was no big deal...I find the blinders bit hard to argue with.
In short, don't hate the playa, hate the game.