Maybe you don't remember the "Bush or Chimp?" posts of some years back. There is a great tradition of comparing our famous people to animals.
There is always a certain amount of silliness in politics. It breaks the tension and alleviates the boredom. I would strongly suggest this is the reason for the Coulter/Afghan hound juxtaposition, not some deeply ulterior misogynistic motive, and that you find something a little more important to get upset over. God knows there's plenty out there.