I agree and I suspect this is not only the case of the CDU. This is a tad too often given a racial twist... I don't know about the Poles in Germany, but the spanish or italian immigrant waves decades ago were not exactly met with flowers and red carpets in the south of France. This kind of clash of cultures is intrinsic to international migration.
Recent anti-immigrant reactions could well be fueled by a sentiment of being overwhelmed rather than enriched by the new culture.
Funny enough, there was a report on France 24 the other day about young german-turks returning to Turkey to profit opportunities there and away from a "blocked" Germany.
What's more worrying though IMO is the situation reflected in this article:
http://www.irishtimes.com/newspaper/world/2010/1026/1224282004386.html

"Long-term surveys are more reliable of public opinion and they suggest more stable and moderate views, but it's far from a happy picture.
Two-thirds (69 per cent) of migrants say they feel happy in Germany, according to a survey commissioned earlier this year by the Bertelsmann Foundation.
However, every second migrant says they don't feel accepted by German society, a figure rising to 61 per cent among those with Turkish roots. One in four Turks feels utterly alien in Germany"

Free at last! Free at last! Thank God Almighty, we are free at last! (Martin Luther King)