** FILE ** In this Nov. 7, 1991, file photo Sen. John McCain, R-Ariz, is hugged by former North Vietnam Col. Bui Tin on Capital Hill after a hearing of the Senate Select Committee on POW and MIA affairs. Tin oversaw the North Vietnamese military prison operation called the "Hanoi Hilton", where McCain was held prisoner during the Vietnam War. Prodded on the 2008 campaign trail to talk about his compelling personal story, McCain usually demurs. "I'm very reluctant to do so, as you know," he said. (AP Photo/Dennis Cook, File)