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Chinese President Hu Jintao, left, and Vice President Joe Biden stand for the national anthems of both countries during an arrival ceremony on Tuesday, Jan. 18, 2011, at Andrews Air Force Base, Md. (AP Photo/Evan Vucci)

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Chinese President Hu Jintao and Vice President Joseph R. Biden Jr. walk the red carpet upon Mr. Hu's arrival Tuesday at Andrews Air Force Base, Md., for the start of a state visit. China's trade with Iran will be one of many thorny issues President Obama will likely raise with Mr. Hu. (Associated Press)

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Chinese President Hu Jintao, accompanied Vice President Biden, waves Tuesday during an arrival ceremony at Andrews Air Force Base, Md. (Associated Press)

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President Obama returns a salute as he and daughter Sasha arrive with his wife, Michelle, and other daughter Malia at Andrews Air Force Base in Maryland on Tuesday after nearly two weeks of vacation in Hawaii. (Associated Press)

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ASSOCIATED PRESS President Obama waves from Air Force One at Andrews Air Force Base, Md., on Wednesday before departing for his Christmas vacation in Hawaii.

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President Obama waves from Air Force One upon arrival at Andrews Air Force Base, Md., on Wednesday, Oct. 6, 2010. (AP Photo/Jose Luis Magana)

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President Barack Obama walks down the stairs from Air Force One upon his arrival at Andrews Air Force Base, Md., on Friday, Sept. 24, 2010. (AP Photo/Jose Luis Magana)

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ASSOCIATED PRESS President Barack Obama walks down the stairs from Air Force One upon his arrival at Andrews Air Force Base, Md., Wednesday, Sept. 8, 2010.

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President Obama walks down the stairs from Air Force One upon his arrival at Andrews Air Force Base, Md., Wednesday, Sept. 8, 2010. (AP Photo/Jose Luis Magana)

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President Barack Obama prepares to board Air Force One before his departure from Andrews Air Force Base, Md., Wednesday, Sept., 8, 2010. (AP Photo/Pablo Martinez Monsivais)

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President Obama salutes as he leaves Marine One before boarding Air Force One at Andrews Air Force Base on Tuesday, Aug., 31, 2010, for a trip to Fort Bliss, the sprawling Army base in El Paso, Texas, where he will speaks to the troops. (AP Photo/Pablo Martinez Monsivais)

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President Obama waves as he exits Air Force One at Andrews Air Force Base, Md., Wednesday, Aug. 18, 2010. (AP Photo/Cliff Owen)

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President Obama walks up the steps of Air Force One at Andrews Air Force Base Md., Monday, Aug. 16, 2010. Mr. Obama is embarking on a three-day tour to raise money for Democrats, beginning in Wisconsin where he will visit ZBB Energy Corp, to underscore what he said was his lasting commitment to a clean energy future.

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President Obama waves from the top of the steps of Air Force One at Maryland's Andrews Air Force Base on Monday, Aug. 16, 2010, before departing for Wisconsin. (AP Photo/Susan Walsh)

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An Air Force member salutes as Air Force One prepares for take-off with President Barack Obama aboard, Monday, Aug. 9, 2010, at Andrews Air Force Base, Md. (AP Photo/Drew Angerer)

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President Barack Obama and Transportaion Secretary Ray LaHood walk on the South Lawn of the White House in Washington, Friday, July 30, 2010, prior to boarding his helicopter for a short flight to Andrews Air Force Base, then on to Michigan where he will tour General Motors and Chrysler factories recovering from the financial crisis. (AP Photo/J. Scott Applewhite)