Ahead of the most consequential European elections of recent times, the signs of a significant rightward shift are unmistakable. In France, Marine Le Pen’s Rassemblement National is now polling more than double its nearest rivals and looks set to record a disturbingly decisive victory. In Germany, the far-right AfD is out-polling all three parties in the governing coalition, despite being embroiled in a series of high-profile scandals. Whether such parties will be capable of forming a cohesive force after the election is another matter. As a Guardian investigation into their funding reveals on Thursday, the financial backing is there. But...