"Definitionally Wicked"

Clive Crook called out Krugman for partisan sniping. Krugman objected and Clive responds:

I do try to be reasonable, which I know can be infuriating, but as it happens I don't think that "being reasonable means declaring, in all circumstances, that Democrats and Republicans are equally in the wrong". Each side is usually somewhat wrong, I find, but the proportions do vary according to topic. I am very much in the Democratic camp on the stimulus, for instance. I think it is unreasonable, on the other hand, to regard everything Republicans say as definitionally wicked or stupid or both, which is the organising principle of everything Paul writes in the NYT.