The investment seeks high current income exempt from federal income tax that is consistent with low risk to principal and liquidity; total return is a secondary goal. To pursue its goals, the fund normally invests at least 80% of its total assets in securities of municipal issuers within the U.S. and its territories; however, it may invest without limit in municipal securities the interest on which may be an item of tax preference for purposes of the federal alternative minimum tax. The fund's dividends are generally exempt from federal income tax, although shareholders may have to pay an alternative minimum tax on income deemed to be a Tax Preference Item.