newt gingrich is no doubt a more nimble intellect, or at least a more gumby-like intellect than mitts, but that can be a strength and it can be a weakness. and you never know what you're going to get with newt gingrich. the there's some challenges that presents to a debater, but i think president obama's self-conception of being a calm, solid, stable, responsible, also quick on his feet, i think he feels like going up against newt gingrich, you might have to do a little bit more gymnastics to keep up with him in the ring, but that people don't want that in a president. they want constancy and stability. >> i think newt's look those ghosts on "christmas carol." they're awful to deal, but once you've gotten past them, you get to be president. and it will be more fun and more charming to debate romney, but you might lose to him. anyway, thank you very much, john heilemann. that's my weird assessment of things. it's better to debate one guy, but probably better to campaign against the other. >>> up next, out with a bang. herman cain's announcement saturday that he's suspending his campai