When rational argument fails

Back when I was in high school, my racist friend Phil announced to me that he was joining the KKK.

"Phil," I said to him, "I don't think you can get in if you're a Catholic."

Phil had an anger problem, which he barely controlled at this moment, and snarled, "The Klan doesn't hate everybody. Don't be so narrow-minded!"

That's an old trick of the bigoted, accusing the broad-minded of narrow-mindedness. Rush just paid the same compliment to Sonia Sotomayor.

When one's political opponent is a liar, how is one to answer?