Christie has regularly stated he is pro-life, and has spoken at pro-life rallies; it isn’t new to him. I’m not sure why people think he’s pro-abortion.
As far as guns go, I’m not aware of him targeting guns while in office.
You are right that his solutions for NJ, while effective, probably don’t mean much to people in other parts of the country. As I’ve said in other posts, he has the right enemies.
http://azpundit.com/the-problem-with-chris-christie-for-2012/
Pretty good article, and Ann Coulter’s also been supporting Romney. Ann’s endorsement meant something before, but she’s really been drifting this last while.
As for his prolife credentials:
http://familypolicy.net/us/?p=9975
He supports abortion in the case of rape, + incest.
As I said, soft on guns and soft on babies. He’s good for New Jersey, but not much else.
He does support traditional marraige, which makes him better than Mitt though.