From FEC records (compiled by Open Secrets):
These folks go with where they think they'll be able to get the most contracting money. Regardless of party.
Yet they donate to Ron Paul?
Regardless of your nifty little graphic, I have been in the Defense Industry my entire life and it is overwhelmingly conservative. Of course you will find a few libs here and there - especially in the DC Area, NJ, and CA. However, the industry as a while is a reflection of the military, which is leans to the right as well.