Two German state elections Sunday could deal a double blow to embattled Chancellor Friedrich Merz, two weeks after his party suffered a stunning defeat at the hands of the far-right AfD. Tight races for power – each with their own unique electoral dynamics – are expected in the city state of Berlin and the northeastern state of Mecklenburg-Western Pomerania. The Alternative for Germany is expected to make strong gains in both, a fortnight after it trounced Merz’s centre-right CDU by a margin of...