Barack Obama

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** FILE ** Carol M. Browner, former administrator of the Environmental Protection Agency, has been President Obama's adviser for energy and climate change. White House officials on Monday confirmed she will leave that post. (AP Photo, File)

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**FILE** President Obama signs a presidential memorandum outlining the next steps for cleaner and more efficient vehicles on May 21, 2010, in the Rose Garden of the White House in Washington. From left: Transportation Secretary Ray LaHood, White House energy czar Carol Browner, EPA Administrator Lisa Jackson, Navistar Chief Executive Officer Daniel Ustian, Waste Management driver Anthony Dunkley and Daimler Trucks North America Chief Executive Officer Martin Daum. (Associated Press)

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US President Barack Obama receives the Nobel Peace Prize during a ceremony in the Main Hall of Oslo City Hall in Oslo, Norway, Thursday, Dec. 10, 2009. (AP Photo/Susan Walsh)

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Egyptian President Hosni Mubarak, left, greets U.S. President Barack Obama upon his arrival at Qubba palace in Cairo, Egypt, Thursday, June 4, 2009. President Obama is due to address the Muslim world in a speech during his visit to Egypt. (AP Photo/Amr Nabil)

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**FILE** President Obama delivers remarks in the Rose Garden of the White House on June 12, 2009. (Associated Press)

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** FILE ** David Plouffe, who led President Barack Obama's winning campaign, stands in the 2008 presidential race, in Obama's Chicago campaign headquarters, May 10, 2007. (Associated Press)

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**FILE** In this photo from May 1, 2010, President Obama talks with Michigan Gov. Jennifer Granholm during the University of Michigan commencement ceremony in Ann Arbor, Mich. (Associated Press)

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**FILE** In this Nov. 24, 2009 photo, President Obama's aunt, Zeituni Onyango, poses in her home in Boston with a framed photograph of herself and Obama when he was an Illinois state senator. (Associated Press)

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President Barack Obama acknowledges the applause of the crowd as he arrives Sunday for commencement ceremonies at the University of Notre Dame in South Bend, Ind. (Associated Press)

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President Barack Obama, with first lady Michelle Obama, enters City Hall in Oslo, Norway to claim his Nobel Peace Prize in 2009. (AP Photo/John McConnico)

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**FILE** In this photo from April 2, 2009, President Obama meets with India's Prime Minister Manmohan Singh at the G-20 summit at the ExCel Centre in London. (Associated Press)

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**FILE ** U.S. President Barack Obama is introduced by first lady Michelle Obama before he makes a presentation in support of Chicago as the host city for the 2016 Summer Olympic Games, Friday, Oct. 2, 2009. (AP Photo/Charles Dharapak, Pool)

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** FILE ** In this April 16, 2008, photo, Janet L. Yellen, president and CEO of the Federal Reserve Bank of San Francisco, speaks about foreclosures to the Bay Area Council Outlook Conference in Alameda, Calif. President Obama on Thursday, April 29, 2010, named Ms. Yellen to be vice chairwoman of the Federal Reserve and filled two other vacancies at the central bank whose decisions influence economic activity, employment and inflation. (AP Photo/Paul Sakuma)

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This photo provided by the White House shows President Barack Obama discussing the START treaty, during a phone call with Russian President Dmitry Medvedev, Friday, March 26, 2010, in the Oval Office of the White House in Washington. (AP Photo/Pete Souza, White House )

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**FILE** In this July 28, 2009 file photo, a car turned in as a clunker sits in a recycle dumpster at Capitol City Buick Pontiac GMC in Berlin, Vt. The Obama administration will bring to an end the popular $3 billion Cash for Clunkers program on Monday giving car shoppers a few more days to take advantage of big government incentives. (Associated Press)

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Mark Ndesandjo, one of President Barack Obama's half-siblings, attends a news conference for his new book "Nairobi to Shenzhen" with the background written "Obama" in Chinese characters, in Guangzhou, southern city of China Wednesday, Nov. 4, 2009. (AP Photo/Kin Cheung)