I really don't know anything about the guy, except his public persona is that of a jerk. Policy-wise, he belongs to that Kennedy clique which believes in using the law to force social change. For the greater good, of course. Like Kennedy, he felt the law didn't apply to him, and like Kennedy, the voters let him get away with it.
At least he admitted that ideology blinded him to the unfolding financial crisis caused in part by Fannie Mae. That doesn't mean he is going to pay for it though. Remember, intentions are more important than anything else.