He co-founded the Livable Rotterdam party and was an early associate of the politician Pim Fortuyn, who was assassinated in 2002.

From 2002 to 2011 he was a member of the municipal council of Rotterdam on behalf of Livable Rotterdam, as well as fraction leader from 2002 to 2010, and from 2007 to 2011 he was a member of the States-Provincial of South Holland on behalf of Livable Zuid-Holland.

Sørensen was a candidate for the Party for Freedom (PVV) in the 2011 Dutch Senate election.

[4] In 2017, he became a member of the Forum for Democracy (FvD) party founded by Thierry Baudet.

He later joined its offshoot JA21 founded by fellow Livable politician Joost Eerdmans.