‘A Fever in the Heartland’ tells how KKK pushed their way into politics with a plan to win the White House

"A Fever in the Heartland: The Ku Klux Klan’s Plot to Take Over America, and the Woman Who Stopped Them" by Timothy Egan; Viking (428 pages, $30) ——— Rich, famous and charismatic, D.C. Stephenson had everything in the world except…