@Robert Gentel,
It was unbelievable, but whether or not it completely derails his candidacy remains to be seen. Remember, the man who was "no Jack Kennedy" became VP, and not the prig who delivered that line.
What has me wondering and, frankly, infuriated is why Christie did it. It was, clearly, very effective as a means to wound another candidate but there was no real upside for Christie. His own internal polling had to have predicted he was toast in NH, regardless of how Rubio finished. There was no reason for Christie to believe that he could take 3rd Place from Rubio, and if he wanted to attack someone to gain any advantage, the obvious target was Kasich.
So why did Christie do it and with such relish?
The obvious answer is that he has cut a deal with Trump. Rubio's meltdown benefited Trump far more than it did Christie. It's easy to imagine that Trump would have been inclined to offer the Attorney General position to Christie without the gift of the attack, so a deal for it seems very possible. We'll know if
The Round Mound of No-Rebound endorses Trump after he pulls out of the race, as I have to believe he shortly will.
A deal like this is par for the political course, and is one of the reasons people with very little chance of winning run for the nomination. I don't like it because it hurts Rubio and helps Trump, but I can't fault Christie if he has simply played a rough and nasty game well, and to his advantage.
The alternative explanation is a lot more difficult to take: It was personal.
Christie has made a point of going after the candidates who are members of Congress as
do-nothing ditherers who are content with arguing about angels and the heads of pins. It's was a predictable line of attack for a governor, but maybe it was more than simply a tactic. He got a lot of criticism for his Sandy related ass-kissing of Obama, from the DC GOP crowd. He's obviously got a thin skin so maybe he's been harboring this and other grudges towards members of Congress in general and Rubio in particular.
Rubio is polished and attractive. Christie is coarse and fat. It could be that simple.
Whatever it was, if it was personal and for any reason other than Rubio led a group of Cuban commandos on a raid which resulted in half of Christie's family being slaughtered, it reveals a very ugly side of the NJ governor; one that could easily have ordered the closing of a bridge, that screwed thousands of his constituents, just to get even with a political opponent.
There is something frightening, but also appealing, about the ferocity of someone who having been set on fire by his nemesis, wraps his arms around his foe so that they may burn together. But this is only appealing if the person the doomed man takes with him is the author of his demise and deserving of his fate. Perhaps Christie blames his lack of success in this race on Rubio, although I don't know why he would. I haven't seen any stories about Rubio dirty tricks being directed at Christie.
There is also something frightening about the depth of rage that might lead someone to try and destroy another person's chances of winning simply because you have lost. Frightening and repulsive.
I'm reminded of the climactic passage in "Moby Dick" when Tashtego nails the sea-bird to the mast and brings it down to hell with him. It made for a stirring scene in the book, but an ugly, despicable one on a debate stage.