Iran held a presidential election last weekend to replace outgoing incumbent Mahmoud Ahmedinajad. Here Ian Bremmer explains why this is not all that dramatic a change. Basically, as I explained to people several years when all the excitement began over Iran's nuclear potential and Ahmedinajad, the presidency is largely a ceremonial position in the Islamic Republic of Iran. The real power is invested in the Supreme Leader. There have only been two so far in the Republic's history: founder Ayatollah Ruhollah Khomeini and his handpicked successor, Ayatollah Ali Khamenei.
In the presidential elections the Supreme Leader and his cronies on the leadership council first vet the candidates and eliminate all who are considered not reliable enough. Imagine in the United States if first Ronald Reagan and then Dick Cheney determined who could run as presidential candidates in the Republican primaries and there were no Democratic Party. That is what Iran is like!