The wisdom of a farmer
The old farmer said, "Well, ya know, Palin is a "post-turtle".
Not being familiar with that term, the listener asked him what a "post-turtle" is. The old farmer said, "When you're driving down a country road and you come across a fence post with a turtle balanced on top, that's a "post-turtle"."
The old farmer saw a puzzled look on the other's face, so he continued to explain. "You know she didn't get up there by herself, she doesn't belong up there, she doesn't know what to do while she is up there, and you just wonder what kind of a dumb ass put her up there to begin with."