Iranians are going to the polls in a closely fought presidential election

Voting has gotten off to a brisk start in Iran's presidential election. Some 46 million Iranians are eligible to cast their ballots. About half of them are under the age of 30. Incumbent Mahmoud Ahmadinejad is facing a serious challenge from the moderate candiate Mir Hossein Mousa-VEE, who says he wants to improve Iran's relations with the outside world. Observers are anticipating a record turnout.