For the same reason that right-wingers dominate business and the clergy: self-selection.
If you believe intensely that everything valuable in our society is ultimately attributable to businessmen, as CLs and PBPs do, isn’t it likely that you will gravitate towards making a living in business? If you think America has turned away from God and is going to hell in a handbasket, aren’t you going to look seriously at a career in religion? Why in the world would these kinds of people want a job in a university, or in the media?
They wouldn’t, and they don’t. Conversely, if you are intellectually gifted, you don’t have a lot of money, you don’t believe in God, but you do believe in the possibility of social improvement, wouldn’t you lean towards a career in teaching, the professions, or the media? Of course you would! And you do, at least in societies in which intellectuals are not directly dependent on the goodwill of a few wealthy patrons.