What famous person was a pow with john McCain?

John McCain was a prisoner of war alongside fellow Vietnam War POW and future U.S. Senator, John "Jack" McCain, who is also known as the son of Admiral John S. McCain Jr. However, a more notable figure he was imprisoned with is the actor and former U.S. Congressman, Sam Johnson, who later served in the House of Representatives. Both men endured the harsh conditions of captivity during the Vietnam War.