In 1965, Binding joined both the SPD and the
IG Metall. From 1986 until 1994 he served as the chairman of the SPD district association in Heidelberg. In 1989, he was elected to the city council of Heidelberg and in 1994 he became chairman of the SPD group in the council until 2000. From the
1998 national elections, Binding was a member of the German Bundestag (lower house of Parliament), representing
Heidelberg. Throughout his time in parliament, he served on the Finance Committee. Within the SPD parliamentary group, he was the deputy spokesman of the financial policy working group from 2002 until 2005 and again from 2009 until 2012; he served as the working group's spokesman from 2012. He was also a member of the working group on municipal policy from 2005 until 2021. On the Budget Committee, Binding served as his parliamentary group's
rapporteur on the budgets of the
Federal Constitutional Court (2005-2009), the
Federal Ministry of Justice (2005-2019) and the
Federal Ministry of Economic Cooperation and Development (2009-2013). In the negotiations to form a
Grand Coalition of
Chancellor Angela Merkel's Christian Democrats (
CDU together with the Bavarian
CSU) and the SPD following the
2013 German elections, Binding was part of the SPD delegation in the working group on banking regulation and the
Eurozone, led by
Herbert Reul and
Martin Schulz. From 2014 to 2015, Binding was part of the SPD parliamentary group's leadership under chairman
Thomas Oppermann. In addition, Binding was the initiator of the bipartisan group resolution which laid the groundwork for the anti-smoking legislation in Germany including the federal legislation in 2007 and some German states' legislation in the following years. In April 2020, Binding announced that he would not stand in the
2021 federal elections but instead resign from active politics by the end of the parliamentary term. ==Other activities==