This rough-and-ready written debate is my favorite such find in many months. It showcases an artful balance of direct replies and playing to the onlookers. (hot slate action)
Assessments from this perspectivist onlooker: I of course agree with the federal judge on most every conclusion they dispute. However, I think the ethicist won the debate on its own terms — both philosophically and popularly. The judge surely scored many points on related issues and evoked a lot of commonsensical sympathies, but he could have done better with what he had. The judge's replies felt a little rushed at the end. Oh, and I must agree with Singer that philosophical argument does matter for cultural change — even as I agree with Posner on other factors mattering more. Posner is too morally skeptical, and that's a big part of why he lost the debate.