While Mr Grossman might make a great governor he has as much chance as I have of winning. First of all he only has a little over $4500 in his war chest. A lot of people in NJ spend more to get elected to a a school board. If you run in NJ as a pro 2A candidate, you will lose. Someone (Bret Schundler?) tried that a few years ago and the Democrats crucified him. He wanted to make NJ a shall issue state. His opposition played it up buying radio ads claiming he was for "hidden handguns".
Christie pretty much has a second term unless he screws up bad. While he hasn't done anything against 2A rights he hasn't done anything for them either. However, he needs to something pro 2A if he wants to look at living on Pennsylvania Avenue in DC in the future. He will have his chance if the current post Sandy Hook legislation gets in front of him. These all are restrictions to restrict the current restrictions in NJ gun laws. He can veto them on the basis of the costs they will incur. This will satisfy a lot of people because when it gets down to it most Democrats don't like paying more taxes either. Christie can also wave this as a pro 2A item in case he runs for the White House.