Drivers fall under a couple of cateories:
-aware and respectful of cyclists
-inattentive/distracted/confused (the majority of bad driving is due to this)
-uncaring toward everthing around them
-agressive toward any 'obsticals' (cyclist or not)
-hateful of cyclists

I'd speculate that political pursuasion has very little to do with being a good or bad driver toward cyclists - or is at best such a small factor as to be within a margin of error of what typically causes bad driver behavior.

So this means that if you are in an area that has more conservatives, then you will have more incident with drivers who are conservative. And if you are in an area with more liberals, then you will have more incidens with liberals. It is so simple.

Al