My prediction on Christie is that he'll still get the nomination. [View all]
I'm betting that there is no evidence that he knew. I'm betting that the investigation comes up empty tying him to it, and goes nowhere on tagging anyone else with anything remotely serious.
There are a number of reasons, the smart way he's handling the scandal now that it's really national news, and the way he's turning Democrats to his favor. http://www.cnn.com/2014/01/09/politics/christie-bridge-fort-lee-mayor/index.html?hpt=hp_c2
The way this is going to play with those who don't follow the ins and outs of Rethug politicians is that Christie was lied to by a staffer, and once the evidence was in that the lie had happened, he reacted forcefully. Then he did the proper thing and offered a personal apology to the Mayor of Fort Lee after a nearly two hour press conference.
The story has legs for another day, or two, and then will fall off of page one, to a paragraph in the national snippets. Especially since he just signed the NJ Dream Act. http://www.washingtontimes.com/news/2014/jan/7/christie-signs-praises-new-jerseys-dream-act-law/
He's covered, and he'll come out of this looking like a serious player who takes the improper actions of subordinates seriously.
Not here mind you, here we're going to be dancing on his grave for a year before he's in it, but out there, the people out there just don't care and the news will go back to ignoring him for the most part.