In one of the most extraordinary presidential campaigns Iran has seen, reformist candidate Mir Hossein Mousavi has borrowed tactics from two seemingly divergent political movements: Iran's 1979 Islamic revolution, and President Barack Obama's run for the White House.

The strategy spawned an odd mix of Iranian revolution-era songs — a famous one begins, "The devil is leaving and the angel is coming" — tied to modern campaign tactics Mousavi's advisers say they ripped straight from the Obama playbook.

Iran's voters go to the polls Friday; a record turnout is expected. The race is viewed as largely between Mousavi and incumbent President Mahmoud Ahmadinejad, a harsh U.S. critic and conservative figure. Two other candidates, reformist cleric Mehdi Karroubi and conservative Mohsen Rezaie, are also running.

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Polling isn't reliable, so it is tough to gauge who is in front. Iranian elections can yield surprising results, but most analysts say it might be a close race and could even go into a runoff.

Regardless of the result, Iranian politics have entered uncharted territory.

Mousavi in particular ran an energetic dark-horse campaign that startled the nation with some of its strategies.

An architect and former prime minister, he has pledged to overhaul the economy, reinstate relative social freedoms and re-engage politically with the U.S. and other Western nations.

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