Best Pun In A Long Time

Paul Krugman, someone one doesn't associate with much wit or humor, pens this paragraph about the John Birch Society Republicans:

In the past, there was a general understanding, a sort of implicit clause in the rules of American politics, that major parties would at least pretend to distance themselves from irrational extremists. But those rules are no longer operative. No, Virginia, at this point there is no sanity clause.