A pre-event vote of attendees and listeners showed 48% support for our “side,” versus 52% for theirs. 82% of thousands of audience members claimed to be willing to change their minds. They were telling the truth, as it turned out. In a bitter slugfest that featured tense confrontations, impassioned oratory (especially from Douglas), and several almost unbelievably petty exchanges, Douglas and I swung the vote 39% in our favor, ending with a 67%-33% win, the most decisive rout in the history of the event.
National Review article on the debate: https://www.nationalreview.com/news/matt-taibbi-douglas-murray-dominate-trust-in-media-debate/
2/3 against 1/3 vote is enough for a constitutional amendment in many places. It's as close to unanimous as one can get without cheating.