Last month, former "NBC Nightly News" anchor Tom Brokaw published his latest book, Boom! Voices of the Sixties: Personal Reflections on the Sixties and Today, and on Sunday night at 9 p.m. the History Channel will run Brokaw's accompanying 2-hour television companion program, "1968 With Tom Brokaw" about that tumultuous decade. Below is a clip from that special featuring Jon Stewart explaining to Brokaw about how the politically-tinged comedy of the Smothers Brothers influenced him. ETP will be running an in-depth interview with the acclaimed journalist later this weekend, touching on his views about his book, the Iraq war, the election, the changing winds of new media, what he thinks the country's biggest problems are — and, of course, what's on his iPod. In the meantime, read an excerpt from Boom! here, and enjoy the below clip from Sunday's special below.