I can hardly recommend the book Rule and Ruin by Kabaservice highly enough. Now half-way through the book, I am learning about the second year of the Nixon Presidency, including his pivot toward catering more to the Southern conservatives. The book reads almost like a good detective story.
Obviously Mr. Kabaservice has indeed investigated thoroughly his subject -- the rise of the radical right within the Republican Party from Eisenhower to the tea party movement. It is a story of intrigue and convenience, of ambition blind and otherwise, and a tale -- we are promised -- of ruin.