The Romney/Ryan camp has apparently insisted that Ryan be referred to as “Mr” during the debate rather than “Congressman.” So Biden — presumably he’s going by “Vice President” rather than like “Doc Biden” or something — has to refer to Ryan as “Mr. Ryan.” Presumably this is because Congress is generally unpopular and they want to seem like outsiders. But isn’t this exactly the kind of thing that makes you seem juvenile when someone leaks this on you? Good idea? Hard to figure.