Staff sizes may rise and fall depending on what projects are under way, as well as the number of people who may be temporarily reassigned from a department or agency to assist. Also, some first lady aides don't just work for her; they report to the president, too.
A look at some first ladies and their staff sizes:
_Michelle Obama: 24, according to her office.
_Laura Bush: Between 24 and 26 by end of President George W. Bush's term in 2009, according to Anita McBride, Mrs. Bush's chief of staff.
_Hillary Rodham Clinton: 13 in October 1993, rising to 19 by March 2000, according to the Clinton Presidential Library.
_Lady Bird Johnson, whose signature issue was beautifying roadways, had a staff of 30, said Stacy A. Cordery, a history professor at Montmouth College in Illinois who studies first ladies.
_Betty Ford had almost the same number.
_Jacqueline Kennedy, who made renovating the White House her cause, had about 40 people on staff, Cordery said.