[jfengel]

This isn't an "odious joke". This is a call for violence.

Nobody believes it's a question, any more than we believe that Henry II was merely inquiring why no one would rid him of that turbulent priest.

It likely doesn't rise to the level of a criminal act. But it's the kind of thing that earns one a stern talking to from the Secret Service. And if somebody actually does take him up on it, there may yet be charges.