Hillary Clinton mentioned Kennedy's assassination as an example (perhaps an unfortunate one) of a LONG campaign. She wasn't wishfully thinking about someone taking out Barak in the late stages. She was pointing out that it happened in JUNE - that's later than it is now. Her entire point (and she used other examples as well) was that this long campaign is NOT an anomaly and that she might still win the nomination (however unlikely that is).
Sometimes the rush to make a sound-bite worthy gaffe leads to this sort of silliness. It's like "MISSION ACCOMPLISHED" which was obviously only a message to the sailors on the boat but the left blew it into a premature declaration of victory. There are a million other examples, but they are all the same. Hillary said something that, at worst, might have been a poor choice of examples. It was obviously not disrespectful or threatening or any of the other ridiculous interpretation. It pisses me off to have to defend HRC, since I have little respect for her and don't trust her any farther than I can throw her. But she is not guilty of anything here. This is just another case of the media making news where there is none, aided, no doubt, by the Obama campaign.
The only difference between politics and "professional" wrestling is that occasionally wrestlers tell the truth.