The rise of Germany’s Alternative for Germany (AfD) is causing widespread alarm, including in unexpected quarters - other far-right European parties. While the German party is winning record levels of support at home, some of its closest ideological allies elsewhere in Europe are keeping it at arm’s length. That tension was again on display after Germany’s recent state elections. In the state of Saxony-Anhalt earlier this month, the AfD made historic gains when it won 43.8% of the vote, falling just three seats short of an outright majority. Elections in Mecklenburg- Vorpommern and Berlin last weekend also showed a exodus...