With the vile rhetoric being spewed towards Bush, DeLat et al, it's possibly a democrat operative sent over from Air America. Their supporters are selling Kill Republican t-shirts, Bush with gun at his head shirts etc. They are running skits with Bush and gunshots being fired etc.
The peanut gallery is nodding their heads in unison approving such threats...
Here's their thread on today's violation of airspace:
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=102x1462674
The sad thing is, I know you are making a joke, but I almost see that as more likely than an Al Quaeda threat...