The differences you must admit are rather large. And would you expect such differences in opinion in say a Physics or Computer Science department by gender or hair colour? I'm willing to bet 20 dollars that differences when breaking down economists by hair colour would be much smaller. I would also expect differences due to age to be comparable order of magnitude but also smaller. I would expect breaking down economists by income or ethnicity would produce similar differences can't say whether greater or smaller.

I'm making these predictions based on my model of this being politics driven.