President Obama's overhaul of the health-care system has done little to improve the nation's fiscal outlook, and his pledge to extend an array of tax cuts for the middle class would only make things worse, congressional budget analysts said Wednesday. In its latest long-term forecast, the nonpartisan Congressional Budget Office predicted that the national debt, which has surged to nearly 60 percent of annual economic output in the wake of the recession, would continue rising in the coming decades despite cost-containment measures in the health overhaul Obama signed this spring.