In this episode of Slate's podcast about campaign history, John Dickerson explains how, despite the efforts of many establishment Republicans, Sen. Barry Goldwater clinched the GOP nomination for president in 1964. Love Slate podcasts? Listen longer with Slate Plus! Members get bonus segments, ad-free versions, exclusive podcasts, and more. Start your 2-week free trial at slate.com/podcastsplus. Email: whistlestop@slate.comLearn more about your ad choices. Visit megaphone.fm/adchoices