Two Republicans who could complicate Christie’s 2016 chances

While Gov. Chris Christie leads many of the national polls of GOP candidates for president, there are still questions about whether it's a reflection of his strength or the weakness of the current Republican field.

But, keep your eye on two possible candidates, who could bump Christie out.

Former Florida Gov. Jeb Bush has still not said whether he will run, but he polls better than Christie and would appeal to many of the same donors Christie is trying to win over.

Meanwhile, Mitt Romney left the door open this week to another shot at the White House.

If either or both go after the nomination, Christie could find himself on the outside looking in.