It really bugs the heck outta me too!
I remember sitting in a San Francisco coffee shop one day, eavesdropping on a couple of gay guys talking politics-they were saying why cant we cons choose a middle of the roader like mccain, of when that happened they still probably voted for the extreme lefty.
It seems like we always do this to ourselves don't we?
Also, when we get a conservative in office all of a sudden he/she does a left turn to get stuff done, when will we get a moderate in there that does a hard right turn?