I agree but the point is that the GOP's Pledge has the 100B number written into it and GOP is unable to get to even that number.
The GOP pledged to reduce the 2011 Budget by $100 billion, the only 2011 budget that exists is Obama’s Budget. What are they supposed to measure budget changes against?
As for the GOP failure to cut $ trillions out of the budget, the vast majority of that is either interest payments, which must be paid to avoid default, or entitlements (Social Security, Medicare, and Medicaid). Yes, they should cut entitlements, but it is political dynamite, which must be handled with care.