If you have any fairly devout Catholic friends out there who are on the fence or seem movable send them to
http://www.votingcatholic.org. Have them take their survey. One of two things will happen. They'll either end up with views mostly opposite of the Catholic Church and John Kerry or they end up with views mostly opposite of George Bush. Either ought to shake them up a bit.
And the best thing is you can present this non-politically, as simply a fun game to see where you stand in conjuction to official statements made by the Catholic Church. It's interesting, give it a shot and send the link to the right people.