Not unless you look at how Berliners vote, that is.
There was no great cross-border migration in the city after 1989. People had security of tenure in their flats, and they stayed put. Berlin had a large concentration of members of the Socialist Unity Party (as the communist party in East Germany was called), as well as the civil servants and Stasi operatives who kept the communist state running, and they have remained in their areas and transferred their loyalty to Die Linke.
PS: Speaking of cross-border migration, whatever happened to Ray? You know, that Dutch dude who ripped off Berlin’s youth services for 30,000 euros while doing his memory loss show for months on end? Well, he just got slammed with all the Härte (severity) of German law and will now have to perform 150 hours of community work AND receive counseling. Yowie. Let me tell you what. The Germans do NOT mess around when it comes to dishing out draconic punishment.