redsa, the ayatollah, i saw one woman who had basically a necklace around her neck with the two supremeders since the revolution saying vote for them. the supreme leader is so central to this election. how much sway does he have over it? >> he's got a lot of sway. iranians are going to be voting for a president tomorrow, but looming very large over this entire process is the supreme leader ayatollah how maini. very few things gets done without his approval. in the race for iran's presidency, the one vote that matters more than any other, analysts say, is this man's iran's supreme lead e. ayatollah ali humani. it's the highest political and overseeing judiciary and foreign policy. he also has final say on u.s. relations in iran's controversial nuclear program. in television debates, candidates seem to refer to the leader just as often as they refer to the iranian people. essentially they're not running for the job. they're almost auditioning for the supreme leader. >> long before he began he 20-year role, he was a fee figure in the islamic revolution that toppled the u.s.-backed shaw of