Unlike others associated with Time magazine, David von Drehle is a skilled, careful, and perceptive writer. So I was interested in his cover story on FOX News’s Glenn Beck, who is considered to be a red-hot commodity these days. I don’t pretend to be an expert on Beck. In the past I assumed he was a typical figure in the pundit and cable-media world. Only recently have I watched portions of his television program, as well as interviews with him, and heard parts of his radio program. And what I’ve seen should worry the conservative movement. I say that because...