I doubt John Kennedy would be endorsing kerry. Their political views are opposites. Taxes, for example, and the war in Vietnam, and personal responsibility (Ask not what your country can do for you , ask what you can do for your country).
I don't doubt it. He was almost as bad as Kerry, now known to have stolen the 60 election with stuffed ballot boxes in key states. He is mostly legend and myth, more than reality. The reality is that he was a mediocre president at best.