I thoroughly enjoyed reading this book. Whipple created an accounting of the White House Chiefs of Staff from Nixon through Obama. The successful and the not so successful. The successful ones were given the authority to actually control the fire hose of information coming into the President. And to prevent the people who attempted to go around them to reach the President with what they thought were unique and special needs. Similar to the military, a lieutenant does not jump the chain of command and go directly to the general, he goes through channels. Otherwise, the General (President) would be overwhelmed with opinions and subject to following the most influential talker, regardless of facts.
As I finished reading this book, I was left with a feeling of awe in how well some of the Chief of Staffs could "herd cats" successfully. It takes a real talent.
I read a lot of political history books, and this one ranks up there with the best. It fills in a lot of holes and explains a lot of actions that I wondered about in my reading of presidential memoirs.