Barack Obama

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President Barack Obama greets the crowd at a rally at the University of Wisconsin in Madison, Wis., Tuesday, Sept. 28, 2010. (AP Photo/Charles Dharapak)

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President Barack Obama greets the crowd at a rally at the University of Wisconsin in Madison, Wis., Tuesday, Sept. 28, 2010. (AP Photo/Charles Dharapak)

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President Barack Obama shakes hands after speaking at a rally Tuesday, Sept. 28, 2010, on the University of Wisconsin campus in Madison, Wis. (AP Photo/Morry Gash)

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President Barack Obama waves to the crowd at a rally at the University of Wisconsin in Madison, Wis., Tuesday, Sept. 28, 2010. (AP Photo/Charles Dharapak)

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President Obama speaks during a discussion with neighborhood families in the backyard of the Clubb family in Des Moines, Iowa, Wednesday, Sept. 29, 2010. (AP Photo/Charles Dharapak)

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Associated Press President Obama chats with a patron during an unscheduled stop at Barelas Coffee House on Tuesday in Albuquerque, N.M. He warned New Mexico voters that Republicans would roll back his agenda.

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Associated Press President Obama chats with a patron during an unscheduled stop at Barelas Coffee House on Tuesday in Albuquerque, N.M. He warned New Mexico voters that Republicans would roll back his agenda.

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President Obama holds a discussion on the economy with neighborhood families in the front yard of a home in Albuquerque, N.M., Tuesday, Sept. 28, 2010. (AP Photo/Charles Dharapak)

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CAMPAIGNING: President Obama said Monday that voters "have a real big choice" to make between the parties in the midterm elections. (Associated Press)

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CAMPAIGNING: President Obama said Monday that voters "have a real big choice" to make between the parties in the midterm elections. (Associated Press)

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ASSOCIATED PRESS U.S. District Chief Judge Royce C. Lamberth last month temporarily halted federal funding for stem cell research on grounds that the Obama administration's rules likely violate the law.

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President Obama signs the Small Business Jobs Act, Monday, Sept. 27, 2010, in the East Room of the White House in Washington. (AP Photo/J. Scott Applewhite)

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President Barack Obama walks along the tarmac with California Attorney General Kamala Harris, center and Lt. Gov. Gavin Newsom, left, after Obama arrived on Air Force One, Thursday, Feb. 17, 2011, in San Francisco, at San Francisco International Airport. (AP Photo/Carolyn Kaster)