Hundreds of millions of voters go to the polls on Sunday in European parliament elections that are expected to tilt the assembly further to the radical and far right, shaping the continent’s future course. Voters in most EU member states, including France, Germany, Italy, Spain and Poland, are called to the polls on Sunday, the final day of a four-day election cycle that began in the Netherlands on Thursday. In the first European election since Britain left the EU, voters are being asked to elect 720 lawmakers to the world’s only directly elected transnational parliament. Opinion polls suggest the mainstream,...