From a piece in May 2006:
"Inside the Pentagon, senior commanders have increasingly challenged the President’s plans . . . A crucial issue in the military’s dissent, the officers said, is the fact that American and European intelligence agencies have not found specific evidence of clandestine activities or hidden facilities; the war planners are not sure what to hit... [A] high-ranking general added that the military’s experience in Iraq, where intelligence on weapons of mass destruction was deeply flawed, has affected its approach to Iran. We built this big monster with Iraq, and there was nothing there. This is son of Iraq,’ he said.”
Hat tip: Shaun Mullen. In the end, Cheney simply couldn't match the facts about Iran. And the Iraq debacle doubtless strengthened his critics.