From 6 to 9 June, around 373 million eligible voters in the European Union will elect 720 new members to the European Parliament in the biggest transnational poll in history. But the vote is likely to be profoundly shaped by domestic issues, despite the EU’s increasingly visible role in addressing common challenges such as security, defence, climate change, cost of living and migration. The ballot is also set to take the political temperature across the bloc’s 27 countries at a critical juncture for Europe, with far-right forces on the rise while centrist parties see support stagnating in many…