Fejér County
Horváth joined MSZP in 1990 and functioned as chairman of the party's Fejér County branch from 2001 to 2002 and since 2006. He served as Socialist group leader of the General Assembly of Fejér County between 2006 and 2010. Horváth was a member of the Parliamentary Committee on Agriculture between 14 May and 1 June 2010. He was appointed a member of the Committee on Sport and Tourism on 14 May 2010.