While stitching a cut on the hand of a 75 year old farmer, whose hand 
was caught in the squeeze gate while working cattle, the doctor struck up 
a conversation with the old man. 
Eventually the topic got around to politicians and their role as our leaders.
The old farmer said, "Well, as I see it, most politicians are
'Post Tortoises’. 
Not being familiar with the term, the doctor asked him 
what a 'post  tortoise' was.
The old farmer said, "When you're driving down a country road and you 
come across a fence post with a tortoise balanced on top,
that's a post tortoise."
The old farmer saw the puzzled look on the doctor's face so he 
continued to explain..........
"You know he didn't get up there by himself, he doesn't belong up there, 
he doesn't know what to do while he's up there, 
he's elevated beyond his ability to function, and you just wonder what 
kind of dimwit put him there in the first place"
               
Best explanation of a politician I've ever heard.