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WASHINGTON, DC - OCTOBER 31: U.S. Vice President Joe Biden (R) congratulates Sen. Cory Booker (D-NJ) (L) after administering a ceremonial swearing-in as his mother Carolyn Booker looks on in the Old Senate Chamber at the U.S. Capitol October 31, 2013 in Washington, DC. Booker defeated Republican Steve Lonegan in a special election to replace Frank Lautenberg, who died in June. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - OCTOBER 31:  U.S. Vice President Joe Biden (R) congratulates Sen. Cory Booker (D-NJ) (L) after administering a ceremonial swearing-in as his mother Carolyn Booker looks on in the Old Senate Chamber at the U.S. Capitol October 31, 2013 in Washington, DC.  Booker defeated Republican Steve Lonegan in a special election to replace Frank Lautenberg, who died in June.  (Photo by Chip Somodevilla/Getty Images)