Database: simpson_episodes
Question: What character did Dan Castellaneta play that won him an award for Outstanding Voice-Over Performance in 2009 in the Primetime Emmy Awards?
SQL: SELECT DISTINCT T2.character FROM Award AS T1 INNER JOIN Character_Award AS T2 ON T1.award_id = T2.award_id WHERE T1.person = 'Dan Castellaneta' AND T1.award = 'Outstanding Voice-Over Performance' AND T1.organization = 'Primetime Emmy Awards' AND T1.year = 2009;