John Dickerson, David Plotz and Emily Bazelon discuss the strength of Donald Trump's campaign for the Republican nomination, the latest results within the Democratic primary race and the loss of Nancy Reagan. The Slate Political Gabfest is brought to you 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. And get $50 toward any mattress purchase by visiting Casper.com/political and using the promo code POLITICAL. And by Concur. Employees get simplified expense reports and business leaders get full visibility into their company’s spending habits. Expense. Travel. Invoice. Learn more at Concur.com /gabfest. And by Texture, the mobile app that gives you full access to more than 150 of the world's most popular magazines, anytime, using your phone or tablet. Read Vogue, People, Esquire, Time—and hundreds more—from back issues to the one currently on the newsstand. Right now, try Texture for free at Texture.com/political.  Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at www.slate.com/gabfestplus. Twitter: @SlateGabfestFacebook: facebook.com/GabfestEmail: gabfest@slate.comShow notes at slate.com/gabfest Learn more about your ad choices. Visit megaphone.fm/adchoices