Sistani constantly dodges in and out of politics (somewhat reluctantly) because he feels forced to act in the best interest of Iraq (e.g calls for elections). Sistani absolutely loathes politics, in London, when he asked me what I plan on studying I said "Politics", he shock his head in dismay and said "Politics is no good, politics killed your father and it is going to kill you"....but read the whole link.
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Update: Is Sistani Promoting Attacks on Coalition Forces? by Bill Roggio and ditto on this: With special thanks to IraqSlogger's Eason Jordan for making the full article viewable to non-subscribers.