Joe Biden

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Vice President Joe Biden meets with Chinese Vice President Xi Jinping in the Roosevelt Room at the White House in Washington, Tuesday, Feb. 14, 2012. (AP Photo/Charles Dharapak)

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President Obama, accompanied by Vice President Joe Biden, former Arizona Rep. Gabrielle Giffords and her husband Mark Kelly, signs Feb. 10, 2012, the Ultralight Aircraft Smuggling Prevention Act of 2012 in the Oval Office of the White House. The bill, which gives law enforcement greater authority to combat illicit drug trafficking on U.S. borders, is the last piece of legislation that Giffords sponsored and voted on. (Associated Press)

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** FILE ** Vice President Joe Biden talks to workers of a Rochester company that has partnered with a local college, Thursday, Jan. 26, 2012, in Rochester, N.H. (AP Photo/Jim Cole)

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** FILE ** Vice President Joe Biden gives a thumbs-up before President Barack Obama's State of the Union address in front of a joint session of Congress Tuesday, Jan. 24, 2012, at the Capitol in Washington. (AP Photo/Saul Loeb, Pool)

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Vice President Joe Biden and House Speaker John Boehner of Ohio applaud President Barack Obama as the president gives his State of the Union address. (AP Photo/J. Scott Applewhite)

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The Obama for America campaign to re-elect President Obama has mastered its official merchandising — including Joe Biden can coolers and Obama-themed gift wrap so popular that it currently is out of stock. (Image from barackobama.com)

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The Obama for America campaign to re-elect President Obama has mastered their official merchandising - including Joe Biden can coolers and Obama-themed gift wrap so popular that it is currently out of stock (images from barackobama.com)

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Vice President Joe Biden comes down to the field before half time of the Army-Navy game at Fedex Field, Landover, MD, Saturday, December 10, 2011. (Andrew Harnik / The Washington Times)

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Vice President Joe Biden comes down to the field before half time of the Army-Navy game at Fedex Field, Landover, MD, Saturday, December 10, 2011. (Andrew Harnik / The Washington Times)

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** FILE ** In this Sept. 8, 2011, file photo President Barack Obama speaks to a joint session of Congress at the Capitol in Washington, as Vice President Joe Biden and House Speaker John Boehner listen. (AP Photo/Charles Dharapak)

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** FILE ** In this Sept. 6, 2011, file photo, new CIA director David Petraeus, right, speaks following his swearing-in ceremony with his wife Holly Knowlton Petraeus, center, and Vice President Joe Biden, left, in the Roosevelt Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais, File)

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South Korean President Lee Myung-bak, left, shakes hands with Vice President Joe Biden after addressing a joint session of Congress at the Capitol, in Washington, Thursday, Oct. 13, 2011. (AP Photo/Cliff Owen)

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Secretary of State Hillary Rodham Clinton, Vice President Joe Biden, and South Korean President Lee Myung-bak, toast each other during a luncheon at the State Department in Washington, Thursday, Oct. 13, 2011. (AP Photo/Ann Heisenfelt)

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Vice President Joe Biden looks on as President Barack Obama makes a statement on his proposed American Jobs Act legislation, Monday, Sept., 12, 2011, in the Rose Garden of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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"Instead of condoning the policy, Vice President Biden should have condemned it in the strongest possible terms," said former Massachusetts Gov. Mitt Romney. "There can be no defense of a government that engages in compulsory sterilization and forced abortions in the name of population control." (Associated Press)

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U.S. Vice President Joe Biden, right, meets Mongolian wrestler during Mini Nadam, or Mongolian wrestling performance, in Ulan Bator, Mongolia, Monday, Aug. 22, 2011. (AP Photo/Andy Wong)

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Israel's Prime Minister Benjamin Netanyahu reaches to shakes hand with House Speaker John Boehner of Ohio as Vice President Joe Biden looks on, on Capitol Hill in Washington, Tuesday, May 24, 2011, after his address to a joint meeting of Congress. (AP Photo/J. Scott Applewhite)

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Vice President Biden greets President Obama upon his arrival Friday at Fort Campbell, Ky. The two came to Fort Campbell to address soldiers who have recently returned from Afghanistan. (Associated Press)

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FILE - In this April 13, 2011 file photo, first lady Michelle Obama and Jill Biden, back left, wife of Vice President Joe Biden, interact with military family members at Coors Field in Denver. ABC says Obama and Biden will be guests on the Monday, April 18, 2011 edition of "The View." They will be appearing live on the weekday talk show to discuss their campaign for national support of military families. (AP Photo/Ed Andrieski, File)