Every weekday evening at 11:35 Eastern, and 10:35 Central time, a camera flies over an applauding and cheering audience and then zooms in on a man dancing with a melodica—a cross between kazoo and a keyboard—who bids the crowd to welcome the night’s host: “Please welcome, Stephen Colbert!” The man of the hour arrives on stage with a twinkle in his eye and a smile playing across his lips, outfitted with his trademark pressed suit,