What could have been a party game of listing coincidental links between Kennedy and Reagan turned out to be quite meaningful. By comparing the two men and their alliance, he is able to compare the cultures in which they grew up with our own era. He goes beyond likenesses we would suspect, such as assassination attempts on both and their handsome, telegenic appearance, to highlight the transitory childhoods of both, and the influence that hard-driving fathers had on both, despite the differences of the beginning point between Joseph P Kennedy and Reagan's father.
Perhaps I'm unduly influenced by his written conclusions since I just finished the book,but it is certainly a fitting testament to the book's power. For instance, the author simultaneously shows that there will be another Kennedy or Reagan towering over a more or less unified culture AND to explain that there opportunity to dominate the media of their day with the helpful cohesion of a Soviet threat that was dangerous to the whole society is part of why we remember them so well. They represent that we want aspects of their leadership again but that, realistically, we don't want the perilous times that produced these men.