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Guttenberg served as the Secretary-General of the Christian Social Union (CSU) from 2008 to 2009. In this role, he was responsible for managing the party's day-to-day operations and overseeing its policy development. He also served as the CSU's chief spokesman and represented the party on television and radio. Guttenberg resigned from his position in 2009 after it was revealed that he had plagiarized parts of his doctoral dissertation.