Guess they didn't get the news about the DSM. Idiots!
Engage a liberal and bait them so they will bring up the Downing Street Memo. Then ask them to give you an overview of what it is about. You'll get verbatim talking points which they can't expand upon or even know why they are spouting them back, or you'll get "well, I didn't read the WHOLE thing but...." It is very satisfying.