Off his usual beat of gravely intoning about how political correctness on elite college campuses is a philosophical threat to American democracy , Jonathan Chait noticed I took a brief swipe at him in today's column about Medicare. He was severely triggered , accusing me of being "deliberately dishonest," and whining about my supposed bad faith and lying on Twitter. Fair warning: this is a pretty silly slap-fight, so people not interested in columnist beefs can feel free to skip. However I think it is an instructive event in some ways. So let me rehearse the argument of the original article . The medical lobby is whipping up fear about Medicare for All by claiming it will cause people to lose their health insurance, and I quote a new lobbying group spokesman to that effect. I argue with a bevy of statistics that this claim is false as a factual matter, and to the extent people will be forced to switch, they will receive superior coverage than what they currently hav