I'd like to say it's because of superior pundit skills, but I guess it was just dumb luck.
I don't know if the talk that Mitt was running was a ploy he worked out with Jeb to blindside Christie or if his head was momentarily turned by all the attention, but if somebody says "No. No. No. No. No. No. No." it's better than even odds that they may actually mean "No."
One person that itches to run is Trump and he is the very last person I would even consider to vote for. He is nothing but a RINO. Do a search on him as to how many times he changed his party affiliation