I thought that was interesting too. What's also interesting is the "cross-tab" results for age. Mitt Romney does best with the 18-29 demo. That struck me as particularly odd - Mitt Romney appeals to the youth?, maybe it's a "hair" thing.
Also, Gingrich does poorly with the kids, but he does very well with the over 65 crowd. This could be important looking at the primaries, because these are the people who vote no matter what. I'm sure this dynamic will change exponentially once the debates start. That might also be the time where some of those who aren't polled, like Pawlenty, either sink or swim.