Heck, he could turn the whole thing around and claim that he stayed involved precisely to stop such irresponsible behavior. And then he'll say "it didn't happen, did it", which would only "confirm" the wisdom of him acting as a "moderating influence".
Try bouncing this off a swing voter, not a Freeper, and see how far it gets. That was part of the problem with Clinton. Some of the attacks were so over the top that they prevented the good ones from sticking. It became "that's just those nasty Republicans again".
I think his testimony before Congress in 1971 is a great avenue because it shoes that he gave sworn testimony without having any personal knowledge of the underlying facts. He misled Congress and the American people. And gee, where have we heard that charge before?