People who work in psychology encounter with unfortunate frequency a particularly frustrating lack of insight. A patient who is partially treated becomes well enough to recognise his symptoms, which were opaque to him previously. To the dismay of those providing treatment, however, he attributes those symptoms to the treatment (usually medicine) rather than the illness. "The medication makes me wake up early and not be able to get back to sleep." No, you are sleeping six fitful hours at night now. You were sleeping only 1-2 hours a night before. "I'm irritable because of the medication you're giving me." No, you were screaming at everyone when you were off medicine. You just don't remember that now.
In a treatment situation, the phenomenon appears in high relief. Yet in subtler forms, it occurs in those without a definable mental illness. Perhaps it occurs in all of us. These partial insights allow us to keep our old pathologies intact. They are, if anything, even more impervious to reason.
The psychbloggers, which make up over half of my siderbar links, tend to be center/right/libertarian in political leaning, and we frequently compare the group defense-mechanisms of the left to those we see in individuals. This is an exercise which necessarily overgeneralises and would be difficult to test. Nonetheless, the technique seems to be proving itself out not just with explanatory power, but with predictive power.
I will venture a touch here: the GWOT has revealed to people that they are in some danger. It is usually not a daily or direct danger, but it could be reasonably said to affect all of us. Parts of the left, and not only the hard left, have concluded that Bush and the neo-cons are the danger. I don't mean those folks who believe that our current policies increase our danger - which I think is wrong on balance but is at least not psychotic - but the wide array of leftists who believe we are descending into fascism, or the Twin Towers conspiracy theorists, or the War For Oil/Halliburton/Imperialism groups.
That thinking also colors their economic thinking: I'm poor because he's rich, and all it's derivative ideas.
If I work on it, I'm sure I'll think of one that conservatives do. It's just not coming to me at the moment.