I watched it too. The "Yes I will" was a throwaway line, uttered quickly and without any conviction, in an effort to bury the issue and move the conversation along to something else. He had been cornered by Russert and just blurted this out to get Russert off his back. The qualifications, stipulations, and evasions will come later, and we will not see the 180, ever.
Lying comes easy to those who make a career living off of rich women.
Like Saddam promising to cooperate fully with the weapons inspectors.