If you look at the current prediction, you'll see the latest polling was from Jan 5-10. This was before the, let's call it, debate-exclusion-gate. Early indication seems to point that Rand's polling has improved by skipping. Let's hope this holds true for future polls.
I found this on Nate Silver prediction for 2012 for Iowa.
http://fivethirtyeight.com/features/in-iowa-six-candidates-compete-to-beat-expectations/ which placed Mitt in the first place.
It will be intresting to see how Rand does in recent polling and how they change Nate Silver's prediction. I know that Nate Silver does well predicting the general election outcome but I wonder his accuracy for the party nominees.