DALLAS (Standard&Poor's) Jan. 24, 2013--Standard&Poor's Ratings Services assigned its 'AA' long-term rating to the Nashville&Davidson County Metropolitan Government (Metro), Tenn.'s nearly $370 million series 2013 general obligation (GO) refunding bonds. At the same time, Standard&Poor's affirmed its 'AA' long-term and underlying rating (SPUR) on Metro's existing GO debt. The outlook on all ratings is stable. "Factors that we believe continue to support the 'AA' ratings include our view of Metro's deep, diversified economic employment base and role as a regional economic center," said Standard&Poor's credit analyst Sarah Smaardyk. "Further supporting the rating in our view is Metro's moderate overall debt levels," Ms. Smaardyk added. Officials plan to use the series