Swift Boat Veterans for Truth
Grant Hibbard, in an anti-Kerry ad by the group Swift Boat Veterans for Truth.
Sen. John Kerry seeks to define his campaign by his combat experience in the Vietnam War — a tour of duty that earned him three Purple Hearts and a Bronze and Silver star for valor. But Kerry's campaign has come under fire by a group of GOP-linked activists who question his wartime conduct in a television ad. NPR's Mara Liasson reports.