Book excerpt: This sterling collection of original, never-before-published essays on six fascinating contemporary presidents by some of the leading presidential biographers of our time is must reading for anyone interested in American politics, the history of the American presidency, or the lives of the presidents. Each essay -- extending and elaborating on lectures originally delivered as part of the Montgomery Lecture Series at Dartmouth University -- explores how a particular president came to power, wielded power, and was changed by power, and how each presidency affected the power of the office itself. The presidencies addressed are those of Roosevelt, Eisenhower, Kennedy, Johnson, Reagan, and Clinton. Published as our nation begins the process of electing the 43rd president, during a time when some believe the independence of the office itself is at stake, Power and the Presidency is a timely and thought-provoking look at the nature of power in American democracy.