The leftists and RINOs have quite different reasons for objecting to Bork. I think it's because he's really an authoritarian statist with a thin veneer of conservatism. The leftists and RINOs object to the conservatism, not the statism (they LOVE statism once they get into power - like Obama or Clinton - "Hey, those are OUR planes now."
But a judge who supports gun control on the basis of a collective interpretation of the 2nd Amendment is somebody that I want FAR AWAY from any judicial post where he has a chance of taking a shot at the Constitution.
Your observation about Bork being a phony conservative is a conclusion I came to a long time ago about the good judge. Bork is a reactionary, not a conservative. He has no problem with unlimited government power as long as it’s used for purposes he agrees with. In that sense he’s really cut from the same cloth of the hard Left he condemns. Barry Goldwater fought the reactionaries who passed themselves off as conservatives from 1981 until the day he died. He told them if “you do it in the name of conservatism I will fight you.” And he did until the day he died.