I'll go out on a limb and say 51 -46 Christie will be the final result... He's not going to lose, but you could see Tea parties voting for Bouno to derail a Christie 2016 campaign.
Christie probably has a minimum of 55%, if he were to upset tea partiers (or already has) and they vote for Buono, they will look complete bafoons. Now, I don't think there are that many that would do that. It would probably be like 1-3% of republicans voting against him, I don't think it will have even a medium affect on the outcome.