When Jimmy Carter's White House was a tour stop for long-haired, 'torpedo'-smoking rock outlaws

Near the beginning of "Jimmy Carter: Rock & Roll President," the new documentary that explores the 39th president's connection to the music community during his four-year term, President Carter offers a revelation involving one of his children, country singer Willie Nelson and what Nelson once described as "a big fat Austin torpedo."

Asked about Nelson's account of smoking marijuana on the roof of the White House at the tail end of Carter's term in 1980, the former president lets out a chuckle.

Nelson, Carter explains in the film, "says that his companion that shared the pot with him was one of the servants at the White House. That is not exactly true. It actually was one of my sons."

It's a brief exchange, but the coy interaction sets the tone for this affectionate, revelatory film about the ways in which a Georgia peanut farmer, on a mission in 1976 to upend