I downloaded the JFK file and found it be be pretty true to the facts. In the stats of charisma and comliness Kennedy set the bar. The definition of media bias perfectly describes JFK whom the press corps found intelligent, humorous, accessable and even friendly. I also think you could bump up military experience and minority appeal a bit. I would push down the experience, integrity and credibility a bit. He was seen as too young by some and that two terms in the house and 8 years as senator is not really overwhelming compared to many. I would also push down his religious devotion a bit as he had to downplay that because at the time he had to show the public he would not be a puppet of the Pope. He was after all, the first Catholic to serve as President.
I would also be interested to see an RFK done. He was not quite as charismatic as his brother, but in many ways he was more than his equal. He was more compassionate, had more experience in different areas of government, and was more credible. I often wonder how the election of '68 would have turned out had it been Nixon vs RFK.