Dubner on Tierney on Haidt on liberal bias in academics (Psychology to be specific):
I have to say that I was surprised at the overt political (leftward) bias exhibited by several prominent economists at the recent American Economics Association meetings, although my sample set was quite small. It is interesting — and sobering — that two fields, psychology and economics, that we rely upon to describe and amend bias in the world are themselves so susceptible to bias within the ranks of its practitioners.
via freakonomics.blogs.nytimes.com
My limited experience tells me that academic economists are more conservative (on average) than faculty in most other academic units. By 'more' I mean the average angle of the lean to the left is more acute.