Not that you need another reason, but here is a good one, and its very short.
Rick Perlstein has a memorable quote in Nixonland, at page 422, of David Broder from 1969, at a time when huge anti-war demonstrations were taking place from coast to coast as the nation came to realize that Nixon had no plan for peace in Vietnam. In a column captioned "A Risky New American Sport: 'The Breaking of the President'", Broder wrote:
It is becoming more and more obvious with every passing day that the men and the movement that broke Lyndon B. Johnson's authority in 1968 are out to break Richard M. Nixon in 1969.
That zebra has not changed its stripes in forty years, has it?
Nixonland is more than just good history. It is also a microscope focused on the origins of much of the poisoned state of public discourse we suffer under today, and a warning of what the Obama campaign is about to face tomorrow and for the next five months. Go buy this book and be prepared to help do what we can to turn back this tide.