Here's a suggestion for the Obama campaign.  Whenever McCain uses the POW-POW-POW argument, flip it on its head and imply that he is saying X is just as bad as being held in the Hanoi Hilton for 5.5 years.

For example, he says he knows what it's like to not have a house or a kitchen table, well then, let's flip that to be: because of the Bush/McCain economic policies, millions of Americans are suffering as prisoners of another war, the Bush/McCain war on America's middle class.

Or spin it a little harder the other way:  Does John McCain really think that his fellow veterans who were held captive manacled to the walls of dirt cells were only as bad off as the millions of American families his chief economic adviser called a bunch of whiners?  Is McCain calling his fellow POWs a bunch of whiners?