National polls don’t matter a bit. Ask Rudy Giuliani.
The primary and caucus winners get a boost, and then the next state to vote can either confirm or repudiate the result.
Iowa and NH often disagree, and then SC decides between the two, or occasionally goes in another direction, and keeps one more candidate alive.
Super Tuesday then accelerates things.
This year, Nevada and Florida will also vote before Super Tuesday, so we could see three different winners among all of the early states.
Romney has Nevada and likely NH locked up. Crazy Iowa could go Paul which they could never live down and, imo, enhance the case for doing away with "tradition."
If Newt is to stay viable, it looks like SC is a "must win" early and FL could go his way but if it goes to Romney, I fear a snowball effect to his benefit.
We know from the Rudy attempt, you can't "start" a campaign in FL.
Even with proportional primaries, I don't see this contest lasting beyond March.