JW 'forgot' about appropriate means? I think you have to look at his earlier past -- pre-Star -- to realize how consistent he has been, as a silky-smooth southern salesman.
You are correct that JW is different from Clinton and Biden, but you are wrong about the difference and accountability. While Clinton and Biden have always been civil servants, JW has always been self-serving.
Accountability? Biden's plagairism cost him a few presidential runs, and Clinton's dirty laundry was thrown out there for the world to see closely, and thus judge accordingly. The JW scandal is small-time, comparatively, and a circus atmosphere, entirely.
Slick JWillie is much slicker and sleazier then Slick Willy himself, with one exception: At least, as far as we know, JW's scandal did not involve an extramarital affair. I give JW credit for that one, as it could have made the story much messier (lol).