For the record, I wouldn't stand behind the 2nd version, and I agree overall with Elf.
But I would, indeed, cut off who I call a "friend" personally if there were some serious rifts in ideologies (tax, maybe not...abortion, yes) that meant we could only socialize around one thing. They'd just be an associate. Hence why I tossed in the "frenemies" element, which I've always understood as a relationship where you know there will be friction, but you need for whatever reason (to be a better self, access, political maturity, etc.) My point is that beyond this Bush/Clinton pair ya'll are speaking on, I would never put it passed someone to epitomize the idea of a friend superficially.