Do health sciences professors really prefer George Bush?

The topic of academic bias has been done to death in the blogosphere, nonetheless I was startled by this recent result.  When it comes to the 2004 election, polled health sciences professors were 48.1% for Kerry, 51.9% for Bush, at least according to one poll.  The social science professors were more than 87% for Kerry, and the physical and biological science professors were more than 77% for Kerry.   Even business professors were more than 65% for Kerry.

What is going on in the health sciences?  They don’t sound especially conservative to me.  On p.28 the authors note that in their sample this is mostly professors of nursing.

Note that the linked article contains some interesting remarks by Larry Summers on the topic of academic bias.