Ahrendtsen was in the municipal council of Odense Municipality from 2006 to 2017. He was first elected into the Folketing in the 2011 general election, where he received 2,462 personal votes. He was reelected in the 2015 election with 4,996 personal votes, and again in the 2019 election with 2,656 personal votes.[2][3][4] In 2023, Ahrendtsen published a book about rindalism titled Rindal: Kampen mod kultureliten og velfærdsstaten (Rindal: The struggle against the cultural elite and the welfare stat).[5][6][7]
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