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WASHINGTON, DC - JANUARY 24: U.S. Secretary of State Hillary Clinton (L) greets Sen. Elizabeth Warren (D-MA) as they arrive for Sen. John Kerry's (D-MA) confirmation hearing before the Senate Foreign Relations Committee to become the next Secretary of State in the Hart Senate Office Building on Capitol Hill January 24, 2013 in Washington, DC. Nominated by President Barack Obama to succeed Hillary Clinton as Secretary of State, Kerry has served on this committee for 28 years and has been chairman for four of those years. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - JANUARY 24:  U.S. Secretary of State Hillary Clinton (L) greets Sen. Elizabeth Warren (D-MA) as they arrive for Sen. John Kerry's (D-MA) confirmation hearing before the Senate Foreign Relations Committee to become the next Secretary of State in the Hart Senate Office Building on Capitol Hill January 24, 2013 in Washington, DC. Nominated by President Barack Obama to succeed Hillary Clinton as Secretary of State, Kerry has served on this committee for 28 years and has been chairman for four of those years.  (Photo by Chip Somodevilla/Getty Images)