Buried deep within Paul Krugman's noxious screed Lessons in Civility, there is an element of truth, though I don't think he meant it the way it came out:
All this fuss about the rudeness of the Bush administration's critics is an attempt to preclude serious discussion of that administration's policies.
Judging by the factually challenged partisan anger generally evident in Paul Krugman's columns as documented by Robert Musil and Donald Luskin, I'd have to say that whomever it is that Paul Krugman thinks is trying to prevent serious discussion of the administration policies has succeeded beyond their wildest dreams.