Why is this Election important?

The election fever is up once again here in Iran. Every body familiar with Iran's power structure inside and outside the country is very much sure that electing a president other than Ahmadinejad will not really change state's international and local politics. Iranians know the supreme Leader is by constitution and under present situation, the ultimate power. He is the one to decide for anything important, and west is well aware too, that the Islamic republic stands radically to its main concerns like Nuke and Arab Israeli issues. Then why is the tenth presidential election so important that the Media actively follow the agenda?
We know since establishment of Islamic republic in 1979, Iranian presidents (except for first two cases in which one was ousted and the other assassinated) all have been twice elected. But this time, Ahmadinejad, the current president is believed to have a big challenge winning the second turn of presidency. As well, he was the first Iranian president that won his presidency in second round of the election back in 2005. On the other hand, supreme leader forcefully has supported and approved the ninth government ever since coming to power. Several times and occasions Ayatollah Khamenei, the supreme leader openly expressed his satisfaction toward the achievements of Ahmadinejad's government. This makes the election sensitive because saying "no" to Ahamdinejad now is a kind of questioning the Leader's evaluation of statesmen.