Frum gives his own version of events. On the conversation with Bartlett:
Did AEI muzzle healthcare scholars? I fear that in reproducing in print a private conversation from some months ago, Bruce Bartlett made a transmission error. I did not report as fact that scholars were laboring under any restrictions. What I did say was that AEI was punching way below its weight in the healthcare debate. I wondered, not alleged, wondered, whether AEI scholars were constrained by fear of saying something that might get them into trouble. To repeat: this was something I asked many months ago in private conversation, not something I allege today in public debate.
Bruce corrects the record.