"Bobby Kennedy: The Making of a Folk Hero" is perhaps one of the most obscure of the books about Bobby Kennedy. Now, I had heard that the authors of this book were a bit overwing in their examination of the Kennedys so I went in with a pinch of salt.
In my opinion, it does a decent look at the man - it is a bit aweing of him at times and it doesn't really do much to stand out from its competitors, but it does paint a personal image of the man.