Two opposing visions for Turkey’s future are on the ballot when voters return to the polls Sunday for a runoff presidential election. The election will decide between an increasingly authoritarian incumbent and a challenger who has pledged to restore democracy. President Recep Tayyip Erdogan is a populist and polarizing leader who has ruled Turkey for 20 years. He is well positioned to win after falling just short of victory in the first round of balloting on May 14. Kemal Kilicdaroglu is a former bureaucrat who leads Turkey’s pro-secular main opposition party and a six-party alliance. He has campaigned on a promise to undo Erdogan’s authoritarian tilt.