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Social Security’s disability program is a political quagmire — and a metaphor for why federal spending and budget deficits are so difficult to control. The numbers are too big; the details too complicated; and the choices, when faced, too wrenching. President Obama’s new budget, projected at $3.5 trillion or more, will raise all these problems. Experience suggests that little will be done to rein in long-term spending and deficits.