Emily Bazelon, John Dickerson and David Plotz discuss the impeachment investigation, a new theory of why conservatives can’t quit Trump, and the court ruling upholding Harvard’s affirmative action program.For this week’s Slate Plus bonus segment, David, John, and Emily discuss the new nutrition guidelines for red meat consumption.You can tweet suggestions, links, and questions to @SlateGabfest. Tweet us your cocktail chatter using #cocktailchatter or post it to our Facebook page. (Messages may be quoted by name unless the writer stipulates otherwise.) The email address for the Political Gabfest is gabfest@slate.com. (Email may be quoted by name unless the writer stipulates otherwise.)Podcast production by Jocelyn Frank.Research and show notes by Bridgette Dunlap. Learn more about your ad choices. Visit megaphone.fm/adchoices