Bushbot - those who are slavishly committed (and probably should be in the institutional sense) to George W. Bush, despite his lack of principles, his proven mendacity, his underhanded and vindictive nature, his general bumblyness, etc.
It's catchy. Use it.
Ex."The Bushbots will claim they're for fiscal responsibility, but they're just protecting their guy"
Make them have to prove the case for Bush using the facts, which shouldn't be too easy.