This cover image released by Dutton shows "Countdown 1960: The Behind-the-Scenes Story of the 312 Days that Chaned America's Politics Forever" by Chris Wallace, with Mitch Weiss. (Dutton via AP)

This cover image released by Dutton shows "Countdown 1960: The Behind-the-Scenes Story of the 312 Days that Chaned America's Politics Forever" by Chris Wallace, with Mitch Weiss. (Dutton via AP)