By Geneive Abdo
Iran Analyst, The Century Foundation
Now that Iran’s presidential election has effectively boiled down to a close race between President Mahmoud Ahmadinejad and reformist challenger Mir-Hossein Mousavi, a struggle has emerged over whether a powerful outside force – the country’s militias, who primarily support Ahmadinejad – should be allowed to endorse a candidate and oversee the balloting on election day.