 Millions of people are voting in Iran's presidential election. They're choosing between a tightly controlled list of four candidates loyal to the supreme leader, Ayatollah Ali Khamenei. There's also one reformist on the ballot, Massoud Pesachian, a former heart surgeon who's previously criticized Iran's morality police. His campaign rallies attracted crowds gathering in the run-up to polling day. The winner of the election will replace Ibrahim Rahisi, who was killed in a helicopter crash last month. This man was voting in Tehran.