FILE - In this Aug. 31, 2011 file photo, President Barack Obama speakst in the Rose Garden of the White House in Washington. President Barack Obama is sacking a controversial proposed regulation tightening health-based standards for smog, bowing to the demands of congressional Republicans and some business leaders. In a statement Friday, Obama said he had ordered Environmental Protection Agency administrator Lisa Jackson to withdraw the proposal, in part because of the importance of reducing regulatory burdens and uncertainty for businesses at a time of rampant uncertainty about an unsteady economy. (AP Photo/Evan Vucci, File)

Associated Press
FILE - In this Aug. 31, 2011 file photo, President Barack Obama speakst in the Rose Garden of the White House in Washington. President Barack Obama is sacking a controversial proposed regulation tightening health-based standards for smog, bowing to the demands of congressional Republicans and some business leaders. In a statement Friday, Obama said he had ordered Environmental Protection Agency administrator Lisa Jackson to withdraw the proposal, in part because of the importance of reducing regulatory burdens and uncertainty for businesses at a time of rampant uncertainty about an unsteady economy.  (AP Photo/Evan Vucci, File)
FILE - In this Aug. 31, 2011 file photo, President Barack Obama speakst in the Rose Garden of the White House in Washington. President Barack Obama is sacking a controversial proposed regulation tightening health-based standards for smog, bowing to the demands of congressional Republicans and some business leaders. In a statement Friday, Obama said he had ordered Environmental Protection Agency administrator Lisa Jackson to withdraw the proposal, in part because of the importance of reducing regulatory burdens and uncertainty for businesses at a time of rampant uncertainty about an unsteady economy. (AP Photo/Evan Vucci, File)
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