BOSTON (Standard&Poor's) Oct. 18, 2013--Standard&Poor's Ratings Services has assigned its 'AA+' rating to the State of Minnesota's general obligation (GO) series 2013D, E, and F bonds. At the same time, Standard&Poor's affirmed its 'AA+' rating, and stable outlook, on Minnesota's GO state bonds. Standard&Poor's also affirmed its 'AA' rating on the state's appropriation debt outstanding and its 'A+' rating on an issue backed by the state's moral obligation. The outlook is stable. "In our view, a key credit strength is Minnesota's deep and diverse economy, with the Minneapolis-St. Paul metropolitan statistical area, the center of the upper Midwest economy, anchoring regional economic hubs," said Standard&Poor's credit analyst Henry Henderson. Additional