This book, the second Cato Institute publication I have read, is as entertaining, engaging and refreshingly objective as it is thoughtful and well-researched (as far as I can judge from the wealth of endnotes, since I am not a political scientist). Alas, how thoroughly we have been indoctrinated from childhood to idolize our presidents -- the more powerful, the better -- to the point where our movie-hero expectations of them interfere with, and can even destroy, their ability to lead.
The U.S. president, in accordance with the worst fears of the Framers of the Constitution, seems to have indeed evolved into an elected king, with Congress usually as his handmaiden instead of his director (as the Framers intended), and with the electorate as an adoring fan club (viz. Elvis), or, in turn, a howling lynch mob (viz. Louis XVI)). However, the author does provide some reassurance that there is little danger of him/her becoming a de facto dictator in the future, with the army as junta.
Since I first heard a couple of thoughtful talks given on C-Span by Cato Institute members Daniel Griswold and David Boaz, I have let this non-profit (non-PAC) organization take me by the hand and lead me to a perch way up in the bleachers where I can now placidly observe the partisan ruckus on the floor of the political arena. Their purpose is libertarian, with a strong conservative bent (small "c"), but without the shrillness of the established parties and their adjuncts. I would also recommend Daniel Griswold's "Mad About Trade", a slender, well-researched and well-reasoned book (also quickly available from Amazon) supporting the many economic advantages of free growth of world markets and unrestricted U.S. participation in them.