Religious hardliners in Iran have used their religious authority in the State to disqualify lots of the opposition from upcoming elections, including the President's own brother.
I'm honestly wondering what percentage of the clergy thinks that this is a long term strategy that can work. There will always be candidates it can't disqualify who will espouse the views it doesn't like. Labor instead to, to some, adopt, for the conservative, co-opt, some essential character of the reform. The existence of a healthy Islamic Republic outside Turkey, is a challenge which the Iranian people have adopted. They outnumber you by far, and your good interest in their well being is the best tool for guiding transformation.