You can think of that roughly $2 trillion swing as coming from four broad categories: the business cycle, President George W. Bush’s policies, policies from the Bush years that are scheduled to expire but that Mr. Obama has chosen to extend, and new policies proposed by Mr. Obama…

About 7 percent comes from the stimulus bill that Mr. Obama signed in February. And only 3 percent comes from Mr. Obama’s agenda on health care, education, energy and other areas.

If the analysis is extended further into the future, well beyond 2012, the Obama agenda accounts for only a slightly higher share of the projected deficits.

How can that be? Some of his proposals, like a plan to put a price on carbon emissions, don’t cost the government any money. Others would be partly offset by proposed tax increases on the affluent and spending cuts. Congressional and White House aides agree that no large new programs, like an expansion of health insurance, are likely to pass unless they are paid for.