Here, the lefties will start by saying, "You have the freedom of speech and that is fine, it is just the WAY that you say it that is so offensive." Think of any discussion about any of the left wing groups; fairies, gimps, squaws, wetbacks etc., and we are forced to use the language that THEY decided is acceptable. "Affirmative action" and "African American" are nothing more than language games, labels, that build bias into any discussion.
I guess these guys will really be offending by the advertising for the "First Annual - Thank God Paul Wellstone Is Still Dead Party!" Of course, there might be opportunity for other bumber stickers, free speech bumper stickers: "If Wellstone is dead, where are the pictures?", "Who got the reward for 'doing' Wellstone?", "Only union made beer at the Wellstone-Is-Still-Dead Party!", and so on.
Remember, their intention is to soften your language to where it is pro-Wellstone and then halo that lack of firm opposition into support for the next scum sucking, neo-commie that the dems run. "Yo, Paul, have you had a chance to meet Uday and Cusay yet; they're only two lakes of flaming sulphur over from you!"
It would be interesting to know who owns the vehicles sporting those stickers -- and their political affiliation...