I saw one of those stickers one time on a POS car at a gas station one time, circa around 2002.
Typical DUmmiemobile, small, covered with stickers (Love Your Mother Earth, Imagine World Peace, etc.), more rust than paint, back seat loaded to the roof with the DUmmie's personal stuff. DUmmie was on one side of a gas pump, with me on the other, filling up my 10mpg 1-ton delivery van, and SMILING AT THE DUmmie THE WHOLE TIME! DUmmie kept looking up at me, with a look on her face like she had been sucking on a persimmon! She finished gassing up, and went into the store, glancing back at me as she went, probably thinking I was going to do something to her car. (Personally, I wouldn't risk soiling my hands by touching the DUmmiemobile.)
Since my truck held 40 gallons, I had time enough to read a lot (but not all) of the stickers, and the ones that made me laugh out loud were "DemocraticUnderground" and "Gore 2004". I stopped reading right there, because I knew the driver didn't have enough intelligence to operate a rock, much less an automobile.
DUmmie driver just happened to be coming out of the store when I burst out into laughter, and as I was leaving, I saw her looking at the back of her car (where the stickers were), as if I had done something to them! (Sorry, DUmmie, I figured if you put them on there, they should stay there, if for no other reason than to alert/warn the world the driver of that vehicle was a certified DUmbass.)