For now, I'll say that the discussion speaks for itself -- and perhaps that it may also illustrate two different ways of approaching and assessing evidence, and two different styles of presentation and argument. My experience in graduate school in England makes me think that among other things we might be seeing here a comparison of two national styles of discourse, Oxford-style debate versus Yank-style. But probably it's just the difference between two individuals.
UPDATE: At the moment I am not at a computer that will load the video of the session. But I hear from my trusty correspondents that, rather than being the whole hour-plus discussion, it's actually a 3:41 clip. The contentious part, as described in David Brooks' column, begins at about 2:30. FWIW.
This article available online at:
http://www.theatlantic.com/technology/archive/2009/07/fallows-v-ferguson-at-aspen-updated/20602/
