Ben Birnbaum writes that former New Mexico Gary Johnson looks set to inherit the small, entertaining Republican primary space occupied by Ron Paul. He also seems set to occupy another space: The anti-Palin. There's a substantial minority of Republicans who don't like her, and with the rest of the field terrified of giving offense, it's a niche that will get him attention and some fans: What does Johnson make of Palin? On a drive through the foothills of New Hampshire, I ask him. Riding shotgun, he turns the question around on me. “Um, I guess some people think she’s folksy,”...