Political Gabfest

John Dickerson, David Plotz, and special guest Betsy Woodruff discuss the Republican letter to Iran's leaders, the Clinton nonexplanation of her private email account, and a University of Oklahoma fraternity's racist chant.   This week's episode is sponsored by “The Jinx: The Life and Deaths of Robert Durst,” the new documentary series airing Sundays at 8, only on HBO.     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.   Learn more about your ad choices. Visit megaphone.fm/adchoices