“Carlson has been keen to focus on the supposed failings and absurdities of Democratic elites, and that puts him in as good a position as any to inherit his supporters—those for whom Trump, as an individual candidate and office-holder, carried some extra appeal beyond the standard Republican brand,” Grant Reeher, a political science professor at Syracuse University’s Maxwell School of Citizenship and Public Affairs, said. Carlson is a prominent, outspoken figure in the party, as he’s boasted anti-immigration, anti-free trade, populism, and America First economics that Trump supporters value. His show has been rated the most-watched cable news program in...