Thom Hartmann is a radio personality, best-selling author, and political commentator whose work in progressive media has spanned decades. He joins us to discuss his latest book, The Hidden History of Guns and the 2nd Amendment, and to explain his own political and philosophical evolution. From working for the Goldwater campaign as a teenager to joining Students for a Democratic Society to help fight the Vietnam War, Hartmann's 1960s roots instilled important values and ideas about democracy, equality, and human evolution that persist in his work today.