On February 14, 1962, Jacqueline Kenedy took CBS News on a tour of the White House. She began a complete restoration of the White House in April, 1961 and established the White House Historical Association. In deference to the Kennedys, little of their restorations changed with subsequent administrations and many credit Mrs. Kennedy with setting the standard for White House design.
See also the Kennedy Presidential Library's page
The White House Restoration for more information.