There are three "keystone deductions" in the IRS code that matter more than all others to Americans who itemize deductions. They are keystone deductions because they help the middle and upper middle class and they promote extraordinarily important social policies which have long been at the center of the traditional values held by most Americans. The first is the deduction for contributions to qualified charities, such as hospitals, high schools and colleges, charities serving everyone from children to the homless to the old and infirm, and of course churches of every denomination. The second keystone deduction allows homeowners with mortgages...