In this Wednesday, May 10, 2017 photo, a supporter of Iranian President Hassan Rouhani hands out his posters for May 19 presidential election in downtown Tehran, Iran. Who wins Iran's upcoming presidential election likely will turn on turnout. Historically, the more Iranians who cast ballots, the greater the chance a reformist or a moderate like incumbent President Hassan Rouhani will be elected. (Photo by Ebrahim Noroozi/AP Photo)
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