I actually know there is at least ONE illegal who drives with auto liability insurance. Also has no fake documents and is probably one of the more honest guys you could find around. It might be okay if this is the only kind that Bush would be legalizing. I'm pretty sure it wouldn't be the majority of illegals who bother with insurance.
More and more are insuring themselves not just against accident, but against the uninsured.
Same deal, with vastly higher cost, in medicine.