Democrats won Wisconsin in every presidential election from 1988 to 2012, but Hillary Clinton’s strategists made the mistake of taking the state for granted in 2016. What they missed were trends brilliantly analyzed by Katherine J. Cramer, a political scientist at the University of Wisconsin, in her prophetic book, “The Politics of Resentment: Rural Consciousness in Wisconsin and the Rise of Scott Walker.” It was published eight months before the 2016 vote.