There's a certain sort of pundit--Charles Krauthammer foremost among them, and as a psychiatrist he really should know better--who gets a certain kick out of pretending to examine the mental state of people with whom he disagrees politically.
I don't tend to like that kind of punditry. People can have different viewpoints and not be insane. They simply believe different things, and starting from different points they wind up at opposing conclusions. Simple.
Joe Lieberman, though...I'm no longer so sure about Joe.
Throughout the long health care debate, he has continually moved the goal posts. He's held out the threat of filibuster again and again. Each time the Democrats in the Senate agree to change the bill in order to accommodate his wishes, he changes his mind again. Most recently, he objected to the public option. But he had been in favor of expanding the pool of people eligible to buy into Medicare, so fine, the Dems ditched the public option in favor of an expanded Medicare. Now he's opposed to that which, three months ago, he was in favor.
His problem is either A) he's utterly dishonest, but afraid to say that he just doesn't want health care reform under any circumstances--despite the fact that a majority of his constituents do--because of the big donations he gets from all those insurance companies in Connecticut, or B) he really has lost his mind, and he can't keep track of his own beliefs, and simply uses what the Democrats are in favor of to define what he opposes.
Either way, CT voters should make sure this is his last term in the Senate, since he's clearly thrown them under the bus. And the Democratic leadership should strip him of every perk he's been given since he "agreed" to caucus with the Democrats, since he clearly did not make those negotiations in good faith. Honest Joe Lieberman is a liar and a fraud. But I hear there's a fine office in the Capitol basement, next to the boiler...