Behrens joined the SPD in 2013 and was deputy chairman of the local association of the SPD Overhagen (village in Lippstadt) from 2014. From 2014 to 2020, he was also the mayor of the district. In 2016, Behrens became chairman of the city association of the SPD Lippstadt and was elected to the city council two years later, where he was parliamentary group chairman for several years. Since 2022, he has been head of the
Soest district association. After initial uncertainties, he was able to enter the Bundestag by being placed 19th on his party's
state list. His political priorities include infrastructure and the economy. == Memberships ==