So does Zarqawi, but he is smart enough to do that he won't get that so he wants the next best thing a fractured militant Iraq. If Sadr can't get it all he will go for the Zarqawi method of a destabilized Iraq that he can carve a part off for himself.
Zarqawi is AQ. He knows he won't EVER be a leader of anything other than his roving bands of terrorists.
He wants to be a kingmaker, not the king.
Sadr has already tried that two times and gotten his arse kicked two times.
His own men fragged him the second time. Don't overestimate his pull because he has some hardcore followers. He doesn't resonate with most Iraqis.