Several elements of Carlson’s monologue — which was swiftly lapped up by the faithful on social media — distinguish him from his forebears. He’s also drawn lines for potential rivals to cross, if they dare. First, and strikingly, is Carlson’s pronounced willingness to strike out against Conservative, Inc., and the small government apparatus that funded much of the early opposition to the last Democratic president. “Members of the media call for a secret police agency. This is the stuff of libertarian nightmares,” Carlson said. “It’s what they claim to hate. Where are they now? Why isn’t billionaire libertarian man of...