Strategy. The fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal securities whose income is exempt from federal income taxes. Any derivatives that provide exposure to the investment focus suggested by the funds name, or to one or more market risk factors associated with the investment focus suggested by the funds name, are counted (as applicable) toward compliance with the funds 80% investment policy. There are no limitations on maturities for individual securities or duration for the portfolio. However, under normal conditions, the funds weighted average effective maturity will exceed ten years. The fund focuses its investments on securities that produce income that is exempt from regular federal income taxes. However, a … Show more… The fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal securities whose income is exempt from federal income taxes. Any derivatives that provide exposure to the investment focus suggested by the funds name, or to one or more market risk factors associated with the investment focus suggested by the funds name, are counted (as applicable) toward compliance with the funds 80% investment policy. There are no limitations on maturities for individual securities or duration for the portfolio. However, under normal conditions, the funds weighted average effective maturity will exceed ten years. The fund focuses its investments on securities that produce income that is exempt from regular federal income taxes. However, a significant portion of the funds income could be derived from securities subject to the alternative minimum tax. The fund invests in various tax-exempt municipal securities, such as general obligation bonds and revenue bonds (including private activity bonds). The fund may also invest in the securities of issuers whose revenues are generated from similar types of projects or operate in similar business sectors with special risks, including healthcare, transportation, utilities, or private activity bonds. The fund may have significant exposure to specific states when the advisers analysis identifies favorable market developments or trends, attractive relative values, or compelling fundamentals relating to a certain state that the adviser believes are underappreciated by the market. These factors will inform overall allocation decisions for the fund and seek to enhance the funds risk-return profile. The fund typically invests in investment-grade securities, which are securities rated in one of the four highest rating categories as determined by at least one credit rating agency or, if unrated, deemed by the adviser to be of comparable quality. However, the fund may invest up to 25% of its net assets in securities that are rated below investment-grade by a credit rating agency or, if unrated, deemed by the adviser to be below investment-grade. Such holdings are commonly referred to as junk bonds. Investment decisions generally reflect the advisers outlook for interest rates and the economy, as well as the prices, yields, and credit quality of various securities in which the fund may invest. Show less