I just finished watching it on a bit of a delay... Obama just kept his cool the whole time. Clinton kept trying to get in punches, but none of them seemed to take hold, and certainly none got under his skin and got him to respond hottly.
Clinton did nothing to help herself here. I stand by my earlier prediction that she will lose Texas... probably by a decent margin, and that she will possibly lose Ohio as well... but even if she pulls out a win in Ohio, it won't be enough. And I don't think she'll try to push forward further if that happens. If she does she'll start looking like Huckabee (even though the margins won't be nearly that large) and only further damage her Senate career. She will know it is time to cut her losses.
She will drop out within 48 hours of the polls closing Tuesday. Probably on March 5th.
She can go on to be the Senate Majority Leader. That will be a fine spot for her.