She is not susceptible to pushback by people who imagine themselves her superiors. Extremely well done.
More on the debate here.
ADDED: I think this clip — I haven't watched the rest of the debate — will resonate with women. A lot of us have had experiences with men trying to control us like this, and we instinctively root for the woman in this situation. I was reminded of the famous Hillary Clinton-Rick Lazio debate, in which the male, Lazio, invaded the zone of personal privacy of the female, Clinton.
AND: You can really feel the disrespect for O'Donnell in that clip. Whether it's because she's a woman or not, I think it stirs something instinctive in many women. It's dangerous for men even to seem to give off the vibe that they're really saying: You don't really belong here, little lady. Hillary has often tried to get us to feel that vibe, and it's worked for her quite few times.