Joseph R. Biden

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President Obama, flanked by Vice President Joseph R. Biden (left) and House Speaker John A. Boehner, Ohio Republican, gestures as he gives his State of the Union address during a joint session of Congress on Capitol Hill in Washington on Tuesday, Feb. 12, 2013. (AP Photo/Charles Dharapak, Pool)

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** FILE ** President Barack Obama, flanked by Vice President Joseph R. Biden and House Speaker John A. Boehner of Ohio, gives his State of the Union address during a joint session of Congress on Capitol Hill in Washington, Tuesday, Feb. 12, 2013. (AP Photo/Charles Dharapak, Pool)

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** FILE ** A bullet is positioned in front of Springettsbury, Pa., Police Chief Thomas Hyers at Girard College in Philadelphia, Monday, Feb. 11, 2013, after a roundtable discussion on gun control with Vice President Joseph R. Biden and other elected and law enforcement officials. (AP Photo/Matt Rourke)

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Vice President Joseph R. Biden speaks at Girard College in Philadelphia on Feb. 11, 2013, after a roundtable discussion on gun control with elected and law enforcement officials. (Associated Press)

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U.S. Vice President Joseph R. Biden, left, gestures at photographers as British Prime Minister David Cameron, behind, bids him farewell after their meeting at 10 Downing St. in London, Tuesday, Feb. 5, 2013. Biden met with Cameron on Tuesday and attended a meeting of the U.K. National Security Council on the final leg of his European trip. (AP Photo/Matt Dunham)

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** FILE ** President Obama listens as Vice President Joseph R. Biden speaks Jan. 16, 2013, at the White House about proposals to reduce gun violence. (Associated Press)

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** FILE ** Vice President Joseph R. Biden speaks Jan. 25, 2013, during a roundtable discussion on gun violence at Virginia Commonwealth University in Richmond, Va. (Associated Press)

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**FILE** Vice President Joseph R. Biden reacts Jan. 21, 2013, with his wife, Jill, as they walk down Pennsylvania Avenue en route to the White House during the 57th presidential inauguration parade after the ceremonial swearing-in of President Obama. (Associated Press)