Daniel Sarewitz at Slate recently caused a kerfluffle with his "Lab Politics" article bemoaning the dearth of Republican scientists. See responses from Mother Jones, Salon, and Discover. For now, I'll just point readers back to my own article at FrumForum in response to the same poll Sarewitz discusses. Also see my posts here and here. I'm sure it's a subject I'll be looking at again in due course.
UPDATE: Also see this post at Commentary,which suggests the AAAS poll sample was skewed. There may well be some truth to that, but it would have to have been very skewed -- implausibly so -- to turn any sizable number of Republican scientists into 6 percent.