Spawn Smacked By Kantian Imperative

Daniel Hannan and his Kantian imperative (Could Labour come fourth on 4 June?). I can't help liking someone who can come up with that:

So, if it won't alter the outcome of the election, why bother with all this door-knocking? Two reasons. First, Kantian imperative. Second, because canvassing a representative sample of your constituents serves as a kind of massive rolling focus group. It tells you what people are thinking. And what they're thinking now, at least in Berkshire, is "How do we get rid of that morose, cack-handed, wastrel, incompetent, incontinent, gurning oaf in Downing Street?"