It's a valid and very interesting question.
Having grown up around hundreds and thousands of self absorbed moonbats, I stumbled onto the following piece a few weeks ago.
I couldn't escape the logic of the thought process employed here. I have lived through everything the author describes. The liberals, including my friend Billy Moonbat, don't just think they are smarter than you- they know they are.
Conjure up your own personal favorite flaming liberal and as you read this- ask if the 7 deadly traits of narcissists apply to them. Think of Hillary, Reid, Pelosi. http://drsanity.blogspot.com/2011/05/political-left-and-seven-deadly-sins-of.html
It's a shame Dr. Sanity closed her blog to comments. I like it.