Haven't we seen this movie?

Interesting choice of words for its headline from The Economist, there. I'd say this is pretty well-charted territory, actually.

The elections in the two states in the former East Germany were being closely watched in Berlin as a measure of the rising strength of extremist parties, left and right, as well as of the weakening position of the centrist parties that make up the current federal coalition. It was the first time since the Nazi era that a far-right party had won a state election.

The returns were seen as a worrying indicator of the health and future of German democracy, and they were likely to intensify a quandary over whether and how mainstream parties can isolate extremists and keep them from entering government.

Well...