That's not Saddam's legacy. Sadr would be inserted into a plastic shredder if Hussein was still calling the shots.
Not to split hairs, but so far... Sadr is President Bush's potential legacy.
Not worried however, since I am a Prez's biggest fan and am confident he'll end up in a spider hole (or worse) just like Saddam.
In looking at the illustration, I interpreted it as a representation of two thugs, and not as meaning that Sadr is the "heir" of Iraq after the fall of Saddam.