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A responsible politician doesn't use the word "assassination" in public discourse. It opens the door for a tragedy. That Clinton will not take responsibility for her use of language, that she doesn't apologize to Obama, but instead bashes him, Joan, is indicative of the craziness that you seem to be belong to as well.
There's also the Slate article and the poll just taken that mentioned the public's concern of Obama's safety and then this "mistake." There's also the fact that she's mentioned RFK assassination before in the campaign. It's incredibly low, and I don't see how you can spin it any other way. (It's hard for me to imagine how you can spin it this way and sleep, but that's your choice.)