Oh is that the guy making speeches on the world stage and getting all the MSM limelight? Not. He was, at one time, a big fish in a small pond. That was until the US told him to back-off...and so-far he's played nice.
Read the news. The Sadrists are one of the biggest elements of the Shia Islamist UIA party. Not to mention that as Iran's dark horse he killed American soldiers and got away with it.