Book excerpt: With a new postscript on the 2016 presidential primaries, this is the story behind today's headlines. In an absorbing narrative, E.J. Dionne Jr. illuminates the history of Republican politics from the Barry Goldwater era through the Reagan Revolution to the crisis of the 2016 presidential election. With that perspective and contemporary reporting, he explains the unrest and discontent on the Right and the Republican Party's bitter civil war while illustrating why a radicalized conservatism has made governing our country so difficult.--back cover.