There was a time when clear blue water separated Europe’s mainstream centre-right from the Eurosceptic populists and xenophobes of the hard right. A Christian Democrat such as Helmut Kohl or Angela Merkel would have had nothing in common with – and nothing to do with – a nativist such as Marine Le Pen or Geert Wilders. No longer. In the run-up to the 2024 European Parliament elections, once-sharp lines between pro-European conservative parties and the nationalist far right are blurring as both seek to tap into public anger or anxiety over migration, the cost of living, the green transition and...