President and Mrs. Reagan wipe away tears during an emotional farewell with White House staffers Wednesday. The get-together began with cheers and applause from the estimated 350 to 400 aides as the president and first lady entered. Gifts were given: riding tack for the president, an avid horseman; a gold and enamel box for the first lady's box collection; and even a replica of the White House for the presidential dog, Rex. Reagan told his aides, "We were all revolutionaries, and the revolution has been a success." On Friday, just before going to the Capitol for President-elect Bush's inauguration, the Reagans will repeat the scene in a private meeting with household staff at the presidential residence. If it's anything like Wednesday's event in the East Room, it will be an emotional affair.