The conservative rivals of Iran's President Mahmoud Ahmadinejad are set to win parliamentary elections.<br /> <br />Officials say more than half the population of Tehran voted in Friday's poll.<br /> <br />They say it's the highest turnout for the capital in more than 30 years. <br /> <br />But many others decided not to take part.<br /> <br />Al Jazeera's Zeina Khodr investigates why.
