New Jersey Governor Chris Christie is quite a favorite here on the ole blog, and just about everywhere else in Republican-land. Talk of him as a 2012 Presidential Candidate is ubiquitous, talk that he he himself has assiduously asserted was folly and that he would not run. This is all well and good, even if he plans to run. Keep 'em guessing, let them build up their sense of anticipation.
But if you're going to say you're not running--you don't get to say "I already know I would win. That's not the issue." If you say you're not running, keep saying it. Say it as often as you can. But saying that you're not running--but that you'd win if you did--is the adult political version of a schoolyard taunt, the kind nobody believed in the schoolyard.