Two Iranians, right, visit the election headquarters of the interior ministry to register their candidacy for upcoming presidential election, as an election worker submits the names, left, in Tehran, Iran, Tuesday, May 7, 2013. Iranian authorities opened the registration process Tuesday for candidates in next month's presidential election that will pick a successor to President Mahmoud Ahmadinejad and offer a critical test for reformists battered after years of crackdowns.(AP Photo/Vahid Salemi)

Associated Press
Two Iranians, right, visit the election headquarters of the interior ministry to register their candidacy for upcoming presidential election, as an election worker submits the names, left, in Tehran, Iran, Tuesday, May 7, 2013. Iranian authorities opened the registration process Tuesday for candidates in next month's presidential election that will pick a successor to President Mahmoud Ahmadinejad and offer a critical test for reformists battered after years of crackdowns.(AP Photo/Vahid Salemi)
Two Iranians, right, visit the election headquarters of the interior ministry to register their candidacy for upcoming presidential election, as an election worker submits the names, left, in Tehran, Iran, Tuesday, May 7, 2013. Iranian authorities opened the registration process Tuesday for candidates in next month's presidential election that will pick a successor to President Mahmoud Ahmadinejad and offer a critical test for reformists battered after years of crackdowns.(AP Photo/Vahid Salemi)
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