This week, citizens of all 27 EU member states will begin to vote in the European parliament elections. One outcome seems inevitable: the far right will make significant gains. Polls suggest that the two groups in the European parliament that harbour far-right parties could secure about 20% of the seats, a fourfold increase since the early 1990s. In four of the six founding EU states, these parties lead in the polls. Where does this far-right success come from? One explanation is that far-right parties have become more moderate over the years, while voters have become more radicalised. Yet research indicates...