The label extremist is usualy put on others by extremist. Recalcitrant would be a better term, but since the low information voter doesn't know what the hell it means, the liberal machine uses the former - it conjures up images of violence to demonize the opposition ie. muslim extremist.
What they are really saying is: if you don't support Obama, you are an extremist!
What they are really saying is: if you don't support Obama, you are an extremist!