Graph on mortgage interest deductions

The folks over at the blog Political Calculations (see here) have an interesting graph on mortgage interest deduction by income (see below, click to enlarge).  About the graph, they say:

As you can see in the chart above, the greatest amount of "losses" to the federal government, at least, from the perspective of a hypothetical government overlord, is represented by taxpayer households who have incomes in the range between $50,000 and $150,000.