No. The show was taped the day before.
I think Carson used to take off every Monday the last few years and had a string of guests hosts. Letterman and Leno do yeoman work, so I don’t blame L for taping Friday’s show on Thursday.
The interview was brutal because Letterman spent so much time trying to discredit Cain he interrupted him many times. Cain held his own and seemed to say what he needed to say. L did give him 3 rounds (segments).
Cain said a couple of times “Dave you’re not going to talk me out of running.” He was responding to the tone L was taking. “You can’t win and even if you do, you won’t be able to do anything.” I guess Dave is implying you have good ideas, but not gonna happen. LOL!