So it’s Ben Carson’s moment. He’s overtaken Donald Trump in a CBS/New York Timesnational poll and he’s ahead in Iowa now with the caucuses just three months away. The Times is writing nice profiles of him full of polite euphemisms like “lack of governing experience.” First we all got used to the idea that it wasn’t insane to think that Donald Trump could be the GOP nominee. And now we have to acclimate ourselves to the idea it could be Carson, too.

The only actual interesting thing about Carson is that he raises a question we rarely get the chance to contemplate: How can a man who is so obviously distinguished and brilliant in one field be such an across-the-board nincompoop in another? Because usually, if a man (or woman) is a good and knowledgeable and sure-footed doctor, or lawyer or department chair or any other position that could…