The nation's largest employer thinks big companies should be required to provide health insurance for their workers.

Wal-Mart, the country's biggest retailer and the second-largest corporation in the world according to this year's Fortune 500, this week endorsed the idea of a so-called employer mandate.

That's a key — and controversial — part of President Barack Obama's health reform plan. It's also a feature of the bipartisan Massachusetts health reforms that cut in ...

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