Must really pi$$ the liberals off to realize that each ribbon represents a vote for W.
You just hit the heart of the matter, I think. The liberals probably think we're taunting them by displaying the ribbons on our cars and trucks. Same with American flag stickers, the other thing guaranteed to send liberals into fits of shuddering rage.
It never failed to amaze me before the election. American flags and ribbon stickers were very common on cars with BC '04 stickers. I did not see a single American flag or ribbon on a vehicle with a Kerry/Edwards sticker.