Only about a third of the federal budget actually falls under congressional control on an annual basis, and much of that is for defense spending -- mostly off-limits for political reasons.
About three-fifths of the budget is dedicated to programs such as Social Security, Medicare, Medicaid, food stamps, crop subsidies and other programs for which spending is automatic -- controlled by formulas. Add interest payments to the list of uncontrollables and untouchables, and the share of spending Washington can actually manipulate from year to year is about 16%.
If that entire 16% -- encompassing programs as diverse and as popular as medical and scientific research, space exploration, maintenance of national parks, repairing roads and bridges -- were eliminated, it would reduce the federal deficit only by less than half. Individually, these programs amount to crumbs on Washington's dinner table, where $38 billion is just 1% of the main course.