With impeachment hearings starting, let’s listen to a couple of past heroes, men of principle, including one whose electoral opponent resigned rather than face his own impeachment. In the first half, I talk with longtime Senator and 1972 Democratic presidential candidate, GEORGE MCGOVERN, followed by my conversation with HOWARD ZINN, a leader of the anti-Vietnam War movement and author of A People's History of the United States. Both were recorded in 2005.