Fiscal Policy: The latest data show a record number of people with no tax obligation. We also have the highest-earning nontaxpayers ever. With more riding the wagon and fewer pulling, it should soon break down. A record number of the 142 million tax returns filed in 2008 resulted in no taxes owed, according to the Tax Foundation's analysis of the latest IRS data. About 51.6 million returns, or 36.3%, were filed by those whose deductions, exemptions and tax credits wiped out any federal income-tax obligation. These aren't people who have overpaid their taxes or had so much withheld from their...