Today's heresy: Sadr for Pres of Iraq

I'm playing devils advocate really.  I'd like to throw the idea out for discussion.  I don't know much about Sadr.  There are four things I do know however and they are things that would qualify him as a good choice.

1.  He is a Shia.  (Read: al Qaeda thinks he is a heretic, so they won't get along too well.)
2.  He hates Saddam.  (Read: he won't want to bring the Baathist back)
3.  Unlike Sistani he doesn't have a good relationship with Iran.  (Read: not likely to want to ally with Iran.)
4.  He has real popular support in the country.  (Read: he won't be dependent upon US troops to stay in power)

So to turn the terrorist question on its head, "why do we hate him?"