The "savings" to be made by instituting Obamacare is a product of this kind of manipulation of assumptions. Even when the people who turn out the budget projections do an honest job, they are working with the assumptions given to them by the politicians.
The fact that the end results carry the imprimatur of the Congressional Budget Office-- or of some comparable state agency or reputable private accounting firm-- means absolutely nothing.
When Florida arbitrarily assumes that it is going to get a future rate of return on its pension fund investment that is roughly three times what its past returns have been, that is the same nonsense as when the feds assume that Congress will cut half a billion dollars out of Medicare to finance ObamaCare.
We would probably be better off if there were no Congressional Budget Office to lend its credibility to data based on hopelessly unrealistic assumptions fed to them by politicians.
One of the reasons why a federal "balanced budget" amendment is unlikely to do what many of its advocates claim is that a budget is just a plan for the future. It does not have to bear any resemblance to the realities of either the past or the future.
We do not need reassurances that do not reassure, whether these reassurances are in numbers or in words. No small part of the reason for the economic collapse we have been through is that federally designated rating agencies reassured investors that many mortgage-backed securities were safe, when they were not.
Not only investors, but the whole economy, would have been better off without these reassurances. "Caveat emptor" would be better advice for both investors and voters.