[t]he goal in finding a conservative writer should be to find a writer who’s not a liberal but who liberals enjoy reading. That doesn’t need to be columns that make liberals feel good about themselves (e.g., conservatives writing about how brain-dead the GOP is, etc.) but it needs to be columns that liberals find not maddening but challenging. When I read Tyler Cowen’s skeptical notes on the stimulus, for example, I don’t become infuriated, I become better-informed about the issue. At his best, this is what David Brooks contributes on that page—he’s raised issues about public choice and so forth that liberals tend to neglect but that are genuinely important.
That’s the standard you should be reaching for, though, people who can take on strong liberal arguments and raise strong doubts about them. Not someone who “drives liberals crazy.”