In this Dec. 17, 2008 file photo, Caroline Kennedy, daughter of former President John F. Kennedy, listens to a reporter's question during a news conference at City Hall in Buffalo, N.Y. Kennedy's missteps and halting speech patterns have been replayed endlessly since she announced her bid to succeed Hillary Rodham Clinton in the U.S. Senate. (AP Photo/Don Heupel, File)

Caroline Kennedy responds during an interview, Friday, Dec. 26, 2008 in New York. Kennedy's name first surfaced as a possible replacement for Sen. Hillary Rodham Clinton in early December after President-elect Barack Obama nominated Clinton to be secretary of state. (AP Photo/Stephen Chernin)

Caroline Kennedy responds during an interview, Friday, Dec. 26, 2008 in New York. Kennedy's name first surfaced as a possible replacement for Sen. Hillary Rodham Clinton in early December after President-elect Barack Obama nominated Clinton to be secretary of state. (AP Photo/Stephen Chernin)

Caroline Kennedy speaks during an interview, Friday, Dec. 26, 2008 in New York. Kennedy's name first surfaced as a possible replacement for Sen. Hillary Rodham Clinton in early December after President-elect Barack Obama nominated Clinton to be secretary of state. (AP Photo/Stephen Chernin)

Caroline Kennedy responds during an interview, Friday, Dec. 26, 2008 in New York. Ms. Kennedy is one of the candidates in the running to replace Senator Hillary Clinton (D-N.Y.) after Clinton is confirmed as Secretary of State in President-Elect Obama's administration. (AP Photo/Stephen Chernin)

Caroline Kennedy leaves the Gee Whiz diner after an interview, Friday, Dec. 26, 2008 in New York. Ms. Kennedy is one of the candidates in the running to replace Senator Hillary Clinton (D-N.Y.) after Clinton is confirmed as Secretary of State in President-Elect Obama's administration. (AP Photo/Stephen Chernin)

Caroline Kennedy responds during an interview, Friday, Dec. 26, 2008 in New York. Ms. Kennedy is one of the candidates in the running to replace Senator Hillary Clinton (D-NY) after Clinton is confirmed as Secretary of State in President-Elect Obama's administration. (AP Photo/Stephen Chernin)

Caroline Kennedy, center, speaks with Save the Children volunteer Virginia Snead after an interview, Friday, Dec. 26, 2008 in New York. Kennedy's name first surfaced as a possible replacement for Sen. Hillary Rodham Clinton in early December after President-elect Barack Obama nominated Clinton to be secretary of state. (AP Photo/Stephen Chernin)

Caroline Kennedy, center, speaks with Save the Children volunteer Virginia Snead after an interview, Friday, Dec. 26, 2008 in New York. Kennedy's name first surfaced as a possible replacement for Sen. Hillary Rodham Clinton in early December after President-elect Barack Obama nominated Clinton to be secretary of state. (AP Photo/Stephen Chernin)

In this Dec. 18, 2008 file photo, Caroline Kennedy, center, arrives for lunch with The Rev. Al Sharpton in Harlem, New York. President-elect Barack Obama's Cabinet choices have sent change trickling down through state politics, sparking a scramble to replace his nominees that will play out in the shadow of the Chicago scandal over filling Obama's own Senate seat. (AP Photo/Bebeto Matthews, File)