This is a very difficult question. I think that there are always little differences between candidates. I think the differences are, as far as our experience shows, related to the daily life of the Iranian people. The massive support for the 1997 elections for President Khatami ended up with those who had supported him deciding not to vote in the 2005 presidential elections. The reason for that is that the legal system in Iran does not allow a comprehensive reform of legislation, and the constitution itself doesn't allow its own reform, or at least the main tenets of it that are preventing the opening of the Iranian political scene.
All these candidates are first generation revolutionaries. They have a very serious past. In the 1980s, Mr. Mousavi was Prime Minister for seven years. During his tenure, thousands of Iranians were executed for political reasons, among them the range going from 14 and 15 to 26 and 27. One episode at the end of his presidency in 1988 includes a prison massacre, a prison killing of prisoners who had been sentenced to various prison terms. Some had also served their sentences but were kept in prison because they had not repented. A delegation went from prison to prison, and as a result four or five prisoners were hanged in a few weeks.
This is no small event. For that reason, I think none of the candidates are campaigning for a substantial or comprehensive legal change and legal reform. Unless there is a campaign for legal reform that would be taking the vagueness of the constitution and the references to vague Islamic criteria out of the constitution and promoting a separation of religion and state, we will be in a legal impasse.