Instapundit zeroes in on a major flaw of Newt Gingrich's - being too much like Obama.
Gingrich is very good at tossing a stinkbomb over the transom, and letting the ensuing reaction demonstrate that there’s something rotten about the status quo. It’s not so clear that this talent is desirable in a President, however. And, even if it is, it’s even less clear that it’s conducive to being elected President. What’s more, I’d say that Gingrich, if elected President, will share one of Barack Obama’s flaws: The tendency to say things that might be interesting if said by a professor, but that have a lot more impact than is desirable when said by a President.