RC2 thinks this set of bumper sticker messages ties the set she saw recently. On the same car were: "Hate is not a family value" and "Shred Ollie" (as in North, from the old VA Senate campaign).
Absolutely the best Leftist bumper sticker, however (because it's funny rather than mean) is one on a car in her neighborhood which reads, "Frodo failed. Bush has the ring."