Some interesting points:
(1) will Gary Johnson take more votes from Clinton or Trump?
(2) I 100% agree that Trump’s performance crashed as the debate proceeded, and Trump’s best moments were in the first 30 minutes or so on the economy.
(3) there does seem to be evidence that the popular perception was that Clinton won the debate.
(4) but a very interesting point is this: are the polls skewed by the possibility that a significant number of voters lie and are too embarrassed to say that they will vote for Trump, as suggested here?