Josh Barro, Columnist

Romney's Worst Tax Secret

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We can debate whether Mitt Romney should have to disclose more about his personal finances. The tax secret Romney can't justify keeping is the detail of his plan to reform the tax code.

Mitt Romney's tax plan is specific in some areas: he'll cut earned income tax rates by 20 percent across the board. But it's vague in others: Romney says he'll pay for rate cuts by broadening the tax base, but he won't say how.