Spackerman says basically all that needs to be said about Michael Rubin here. As a general point, I agree with him that liberals need to do a better job distinguishing between serious, good-faith participants in the public discourse who they disagree with (Roger Cohen, say, or David Frum) and bad-faith participants whose credibility comes from a sinecure at AEI and is used to smear liberals as anti-semites (Michael Rubin). Maybe we need a test, or set of warning signs. For instance, whenever you hear one of them call something the "George Soros-funded" whatever, that's probably a good sign your time would be better spent listening to someone else.