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It is Angela Merkel’s home state. There aren’t even many refugees there (23,000 in 2015 to be precise). But on Sunday rural Mecklenburg-Vorpommern earned a small footnote in post-war history, becoming the first state where the CDU has ever been outflanked by a party of the right. Just three years old, the anti-immigrant Alternative for Germany upstart is steadily gaining electoral ground. It may be far from seizing power, even at local level. But the warning to Ms Merkel is clear.