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Jarchow was in the 1990s member of the Statt Partei and vice-chairman of this party in the state of Hamburg. In 2007 he became a member of the liberal FDP. At the Hamburg state election, 2011 he was elected in the Hamburg Parliament. Since April 2011 he is a member of the Hamburg state executive board of the party. Since March 2011 Jarchow is chairman of the football club Hamburger SV.