The Build America bond program is also helping to postpone immediate cash crunches.

FORBES: Buffett Frets Over Municipals, So Should You

According to Invesco Powershares, the Build America Bond program was launched by the U.S. Treasury under the American Recovery and Reinvestment Act of 2009.

FORBES: Uncertainty Leads Bond ETFs Higher

Powershares Build America Bond Porfolio ETF ( BAB) normally invests at least 80% of its total assets in taxable municipal securities eligible to participate in the Build America Bond program created under the American Recovery and Reinvestment Act of 2009 or other legislation providing for the issuance of taxable municipal securities on which the issuer receives federal support of the interest paid.

FORBES: Uncertainty Leads Bond ETFs Higher