Walmart Foundation President Sylvia Mathews Burwell stands on stage in the East Room of the White House in Washington, Monday, March 4, 2013, as President Barack Obama announced he

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Walmart Foundation President Sylvia Mathews Burwell stands on stage in the East Room of the White House in Washington, Monday, March 4, 2013, as President Barack Obama announced he would nomination Burwell to head the Budget Office. (AP Photo/Carolyn Kaster) less