This thug Sadr is not well respected by Iraqi Shiites, specifically because he is not an Ayatollah. He is way too young and hasn’t completed the study neccessary for the honored title of Ayatollah.
The most powerful Ayatollah in Iraq is the Grand Ayatollah Sayyid Ali Husaini Sistani. Sistani, interestingly enough has a website. It’s a very well done website as well. I, being a shameless infidel, mainly read the parts about anal sex (permissible with consent (?), but discouraged), masturbation (not permissible), and temporary marriage (short-term contract so as to legitimize hooking up – all good). His writings and proclamations seem very calm, peaseful, and wise. I was especially impressed with his Islamic Laws for Muslims in non-Muslim countries. He seems like a pretty chill guy, and the US would be wise to cultivate him.