The one subject that seems to be the third rail in this otherwise no-holds-barred campaign is John McCain's POW experience in Vietnam 40 years ago and how that affects his qualifications now. At the GOP convention last week, numerous speakers described the details of McCain's ordeal as evidence of his moral fiber and suitability for the presidency. Even McCain, who had been reticent to talk abut the details in the past, devoted part of his acceptance speech to the subject. But what is the relevance of those five years to qualities needed in a president? We talk to former POW's who have insight into the question and look at McCain's naval upbringing. Was it a life that prepared him to understand the live of ordinary Americans?