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Election officials check people's ID cards at a polling station in Tehran on May 19, 2017.
Iranians head to the polls for a vote that has become a referendum on President Hassan Rouhani's policy of opening up to the world and efforts to rebuild the stagnant economy. / AFP PHOTO / Behrouz MEHRI        (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)
Election officials check people's ID cards at a polling station in Tehran on May 19, 2017.
Iranians head to the polls for a vote that has become a referendum on President Hassan Rouhani's policy of opening up to the world and efforts to rebuild the stagnant economy. / AFP PHOTO / Behrouz MEHRI        (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

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    What's at stake in Iran's presidential election?

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What's at stake in Iran's presidential election?

Polls have opened across Iran in what looks set to be a tight race, as Iranian President Hassan Rouhani seeks a second term.

What's at stake in Iran's presidential election?

Polls have opened across Iran in what looks set to be a tight race, as Iranian President Hassan Rouhani seeks a second term.