Medary.com

Rapidly becoming one of my more favorite blogs (despite, or perhaps because, of the rather salty language), Ace of Spades HQ, where in this entry the eponymous Ace notes a universal truth:

The main annoyance of debating an unhinged partisan is that, if any premise is helpful to their argument, he asserts it must be true. After all, he knows he's right, he knows his cause is right, therefore he knows his argument is right, and therefore, QED, and necessary premise for proving his argument must be true. It's a "fact" because it must be a fact.

I try to be a hinged partisan (or, as I prefer, a rational human being).  With luck I succeed, more often than not.