Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) -- Mir Hossein Moussavi, Iran's former prime minister, has emerged as a serious contender to Mahmoud Ahmadinejad, who was, for months, considered a shoo-in for re-election to the Iranian presidency. Presidential candidate Mir Hossein Mousavi holds up the "V" sign after casting his vote on Friday. A painter and architect who withdrew from the political front for two decades, Moussavi has emerged with a platter of promises. He has said he wants to reform Iran into a global communicator that embraces freedom of speech. He's also taken an usual step in politics in Iran by relying heavily on his wife, a college professor. Her public support of his candidacy has underscored his professed support of women's rights.Mir Hossein Moussavi, Iran's ex-PM, hasn't worked officially in politics in 20 yearsAnalysts: He is wooing support by portraying himself as the "anti-Ahmadinejad'Moussavi says he's a reformer, believes in more freedoms and an open IranAuthor who has interviewed him says she is skeptical that he truly feels that way 
 Question:Signs aloft, some are wearing green headbands and chanting "_, Moussavi!".

Mir Hossein Moussavi