The Heritage Foundation:  The President’s 2013 Budget: More Troubling Tax Increases in the Fine Print, by Curtis S. Dubay:

Buried in the fine print of President Obama’s FY 2013 budget proposal is an expansion of his cap on itemized tax deductions—to now include exemptions and exclusions. Applying the cap to exemptions and exclusions is yet another way the President has devised to increase the already sizeable tax burden shouldered by families and small businesses who earn $200,000 or more a year. This policy change so badly violates the basic tenets of sound taxation that it is little more than a move to further punish the most successful Americans with yet another confiscatory tax increase. Congress should reject the President’s cap, like it has in the past, and focus on revenue-neutral fundamental tax reform that would lower tax rates and improve neutrality to encourage economic growth.