In Arkansas, the income tax when (Huckabee) took office was 1 percent for the poorest taxpayers and 7 percent for the richest, exactly where it stood when he left the statehouse 11 years later. But, in the interim, he doubled the standard deduction and the child care credit, repealed capital gains taxes for home sales, lowered the capital gains rate, expanded the homestead exemption and set up tax-free savings accounts for medical care and college tuition. Most impressively, when he had to pass an income tax surcharge amid the drop in revenues after Sept. 11, 2001, he repealed it three...