Only in politics is it possible to mock someone for AGREEING with you. In any other arena, making a good argument and convincing someone who had previously disagreed with you would be a nice boost to your ego, and would raise your opinion of the other person for having seen the light of reason even though it forced them to admit that they were wrong. But not if you're a conservative...to them, changing your mind, even if it's in a good direction, is admitting defeat and weakness and will subject you to even more vicious mockery than when you disagreed with them.
If anyone is curious as to why I despise "conservatives", this is why. I have no problem with someone holding a view I disagree with and trying to convince me that their way is better, as a scientists and an engineer, I'd be pretty hypocritical to reject in politics what is the foundation of my field. But righties don't seem to be like that, it's not about convincing anyone or making a valid argument...it's about nothing more than cheap political point scoring. And on this topic in particular, I get the strong impression that if Democrats turned around and supporting staying in Iraq, Republicans would be protesting for immediate pull-out the very next day.