It does not even have to be that big in order for it to be devastating - he needed a good performance to keep his momentum going and he didn't get it.
He doesn't need to win New Hampshire, he just needs to do better than the other establishment candidates. If they perform poorly then they will drop out and that support will go to Rubio. This is all he needs. If this gaffe is bigger than I think it is and propels Christie to competitive levels with Rubio then that could be it, but I just don't see that happening.
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