When the waitress arrives for drink orders, ask her to wait while you ask your date her opinion of Sarah palin.
Any answer along the lines of "I think she's an intelligent person, an inspiration...", etc should be met with you shaking your head in disgust and walking away.
If she calls her a dumbass, then you laugh out loud, say "whew, she passed the Palin test" and proceed to order those apple-tinis.
Very important. You don't want to be halfway through your entree and suddenly feel ill by discovering your date has the IQ of a red-eyed tree frog.