In a 2012 opinion piece bemoaning the state of the US Senate, Washington Post columnist Dana Milbank cited a "leading theory: There are no giants in the chamber today." Among the respected members who once walked the Senate floor, admired for their expertise and with a stature that went beyond party, Milbank counted Sam Nunn (D-GA). Nunn served in the Senate for four terms beginning in 1972, at a moment when domestic politics and foreign...