From the Article:
More troubling, Romney has repeatedly refused to share specifics of his radical plan to simultaneously reduce the debt, get rid of Obamacare (or, as he now says, only part of it), make a voucher program of Medicare, slash taxes and spending, and thereby create millions of new jobs. To claim, as Romney does, that he would offset his tax and spending cuts (except for billions more for the military) by doing away with tax deductions and exemptions is utterly meaningless without identifying which and how many would get the ax. Absent those specifics, his promise of a balanced budget simply does not pencil out.