Jennie Johnsen was a youth leader of the Young Liberals of Norway before becoming a vice leader of the Liberal Party and being elected in the Skien city council in Vestfold og Telemarkcounty.
From 1998 to 2001 she was the leader of the Young Liberals of Norway, the youth wing of the Liberal Party. She was a vice leader of the Liberal Party from 2002 to 2004. In 1995, at only 17 years of age, she was elected to serve in Skien city council. Vestfold og Telemark 
