Corruption of tax policy extends to the local level. This piece from the Washington Examiner examines the effect of property tax exemptions on the tax burden for the less favored. http://www.washingtonexaminer.com/opinion/blogs/beltway-confidential/Goldwater-Institute-investigation-exposes-dark-side-of-special-tax-deals-84738592.html
At the federal level, the Hedge Tax would eliminate the exemptions for Municipal bond interest (this would take 20 years). Somehow the idea that voters in Iowa should bear part of the burden for a sports palace in Houston seems wrong to the Hedgehog.