The discount retailer already has made major inroads into accessible, affordable care through lower drug prices, walk-in clinics and electronic record-keeping. Why stop there? Wal-Mart has done more to expand coverage and lower costs in the past year than any government program to come out of Washington in the past 10 years. And I'd bet the new programs that this company has announced in the past year will do more to expand coverage and cut costs than anything likely to come out of a McCain, Cl