This could be the start of a very important change of direction for Iran.
From the BBC:
Hassan Rouhani leads Iran presidential election vote count
Early results from Iran's presidential election put the reformist-backed candidate, Hassan Rouhani, in the lead.
Official figures give him 51% of the five million ballots counted so far - well ahead of second-placed Tehran mayor Mohammad Baqer Qalibaf on 17%.
If Mr Rouhani maintains that margin, he will be able to avoid a run-off vote.
Electoral officials said turnout was high among the 50 million Iranians eligible to vote on Friday for a successor to Mahmoud Ahmadinejad.