I think NJ (or NY for that matter) is waaaay too entrenched in unions to allow Christie any room to fight with them. (Although I agree that perhaps some concessions can be made).
He's definitely not for the Walker ideal:
http://newyork.cbslocal.com/2011/03/01/gov-christie-responds-to-public-union-support-poll/As those protests continue in Wisconsin, there’s new evidence unions still have a strong foundation of support.
According to a new CBS News-New York Times poll, Americans surveyed oppose weakening the unions’ collective bargaining rights by a margin of almost two to one: 60 to 30 percent.
“Some states are trying to take away some of the collective bargaining rights of public employee unions. Do you favor or oppose taking away some of the collective bargaining rights of these unions?” the poll asked.
New Jersey Governor Chris Christie said collective bargaining rights are not an issue in his state.
“I understand you guys, it’s an entertaining story and you want to keep it going, so I’m sure you worded a poll in a way that kept it going.” Christie said.