Atlantic Philanthropies Stakes $25-Million on Health-Care Lobbying Group

In the scramble to carve out a role in the health-care debate, Atlantic Philanthropies has stepped forward with perhaps the most aggressive bet among nonprofit players.

Since last year, it has awarded $25-million to push President Obama and members of Congress to support a health plan that covers all Americans, includes a government-run insurance program, and makes medical services more accessible to minorities and poor people.

Atlantic gave the money to Health Care for