A Washington, DC, couple has donated $25 million to fund diabetes and obesity research and a host of other initiatives at the city's Children's National Medical Center. The gift from Diana and Stephen Goldberg comes as Children's Hospital raised an additional $30 million in smaller donations to help kick off the hospital's $500 million campaign. The Goldberg gift will go toward every major division of the hospital, and also will help Children's expand its $50 million endowment. Hospital officials said increasing the endowment is necessary to recruit top doctors and their staffs to conduct research here.