From a friend in Boston, a note that gives an extended version of a theme in many responses I've received. Background here and here. Charts and data on this point shortly. The argument here -- that, along with smoking, obesity has become a class-bound marker and problem in America -- is hardly surprising, but the power of the connection is what many people emphasize.
"i wonder if your seeing fewer overweight people than you expected when you got back to the states might be, at least in part, a function of class. this is a point i'm somewhat uncomfortable making, but it shouldn't be ignored. people who, just as a for instance, run and listen to npr and read (not to mention write for) the atlantic are both likelier to be fit and likelier to associate with people of the same ilk. (as a nation, we've not only gotten fatter but also, as you know, much less likely to mix with people who don't share our educational or cultural background.)
"i remember walking through harvard yard back in 1986 during the university's celebration of its 350th anniversary. the place was awash in alums, and there was something noticeably different about most of these people. it wasn't that they were expensively dressed or looked like preppies, i realized. it's that almost everyone was so *trim.* none of these people would likely be found shopping in wal-mart, where waistlines look a lot different.
"as an aside: i've long thought it would be an interesting commentary on the stratification in this society to have political candidates asked during a debate if they'd ever shopped at a wal-mart. i have to think that very few could honestly answer yes--and the higher the office the fewer the yeses. to think that a democracy's leadership class should have no connection (other than owning stock--or, in hillary clinton's case, being once on its board) to the biggest corporation in the country, how strange! back when the biggest corporation was gm or exxon, even the wealthiest people likely had *some* dealings with it, even only being chauffered in a cadillac."
To answer the last question: I'm not a political candidate, but I have not only shopped in W-Ms around the US but have also been to many outlets inside China. That's a story on its own -- the one in Shanghai has whole pig carcasses suspended by hooks right inside the front door, and tanks full of live carp, which the shopper-housewives let flop around on the floor to see which ones look best for the evening's dinner. No one will ever convince me that W-M doesn't know how to globalize/localize.
But I digress. To sharpen my friend's question: a candidate should be asked when was the most recent time he or she enjoyed Every Day Low Prices.