In this episode of Slate's podcast about presidential campaign history, chief political correspondent John Dickerson concludes the tale of the 1980 Democratic primary fight between challenger Ted Kennedy and incumbent President Jimmy Carter. Whistlestop is sponsored by Casper, an online retailer of premium mattresses for a fraction of the price. Casper mattresses come with free delivery and returns within a 100-day period. Right now, get 50 dollars toward any mattress by visiting Casper.com/whistlestop and using the promo code WHISTLESTOP. 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