If anybody can understand this after 90 minutes, it's the guys at Jane Street.
The primary impact appears to have been to increase the undecided votes which (assuming a high quality audience) implies to me that many members of the audience were somewhat irrationally polarized to begin with (as might be reasonable) and many people heard things from "the other side" during the debate that they had never heard before and updated towards 50/50 ignorance based on the debate. (Perhaps there is some wishful thinking in this model? Hard to tell.)
If this model of the debate and audience is right, it suggests that no one (neither H...
Link: overcomingbias.com/2011/07/debating-yudkowsky.html