The electoral success of the post-communist PDS has surprised politicians and academics alike. The PDS has been able to find a niche for itself within the German polity by articulating territorially salient political difference. The PDS has expanded its voter base beyond merely the politically disaffected and the former 'Dienstklasse' of the GDR, as it has developed into an effective articulator of eastern German interests. Western German parties have been unable to incorporate differences in eastern German attitudes and perceptions into their political platforms ¿ leaving space for a regionally concentrated political party (the PDS) to establish itself.