Everybody who has thought seriously about the Obama candidacy, including me and probably including the Senator himself, have reflected on the horrible possibility that he would be assassinated. One cannot think about Obama, the Kennedy-esque candidate without worrying about his safety. But we all observe the discipline of not raising the issue in public. We all worry that to do so would be to encourage some maniac to take a shot. Now Hillary has violated this unstated but heretofore universal taboo and brought up the possibility. That is not to say that she is hoping for a murder. But it is to say that the possibility is uppermost in her mind and a significant part of her rationale for staying in the race. And, by raising it, she has made it more possible.