President Obama announces in the East Room of the White House in Washington March 4, 2013, he will nominate, Gina McCarthy to head the EPA; MIT physics professor Ernest Moniz for Energy Secretary; and Walmart Foundation President Sylvia Mathews Burwell to head the Budget Office. (Associated Press)

Photo by: Carolyn Kaster

President Obama announces in the East Room of the White House in Washington March 4, 2013, he will nominate, Gina McCarthy to head the EPA; MIT physics professor Ernest Moniz for Energy Secretary; and Walmart Foundation President Sylvia Mathews Burwell to head the Budget Office. (Associated Press)