John Sides, Lynn Vavreck: The Gamble: Choice and Chance in the 2012 Presidential ElectionPrinceton, N.J.: Princeton University Press, 2013, (ISBN: 978–0691156880) 331 pp. $29.95 (hardcover); Princeton University Press, 2014, (ISBN: 978–0691163635) 331 pp. $19.95 (softcover)