“Never ever lose your sense of outrage," said then-Democratic presidential candidate Sen. Bernie Sanders. On this edition of River to River , Ben Kieffer talks with the senator about the 2016 campaign, his plan to introduce a single-payer health care bill in September, and his new book, Bernie Sanders Guide to Political Revolution . Sanders will speak in Iowa City August 31 at 7 p.m. at Hancher Auditorium .