Looking at the latest polling, Rubio looks to be on the move up. Trump looks to be stuck in the low 30s in Iowa polls. Cruz is losing some support and Rubio has reached the high teens. With a good debate tonight, I could see Rubio being the big surprise come Monday night.
If Marco reaches the mid 20s or higher and finishes second or a close third, he will be the one people are talking about coming out of Iowa. If Trump's inevitability is punctured, he could drop pretty fast in NH. I have long contended that there is no way the Republicans will nominate Trump. Rubio looks to be the establishment candidate emerging. If this is a two man race between Trump and Rubio after SC, I think we see Rubio win the nomination.