I am pretty sure if you ask your psychology professor why people like political signs or any signs for that matter it is twofold first they like to show support for their preferred candidate or brand whether it's a political party or a particular breed of dog. Secondly there are a small percentage of those that are undecided for truly Clueless. In this way assign his people a chance to think Pro or con about various candidates.
I truly like the comment above about rear bumper stickers are there just because of the rust spots!!!
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