It won’t come as a surprise to any arts organization which has tried to mount a major fund-raising campaign in the last year, but the Smithsonian is facing a rather severe drop in donations. “In the six months ending in March, the Smithsonian raised $51 million. In the same period a year earlier it brought in $117 million — including $10 million gifts from Lockheed Martin, General Motors and the James S. McDonnell Charitable Trust. But even without $30 million in major single gifts, the fundraising is down $36 million.” Officials at the nation’s largest museum complex are staying upbeat, however, saying that they believe the drop to be a temporary problem.