Whoever takes a position in the interim government CAN NOT run for office in the first elections. I would imagine this man would be perfectly suited to run for, and win, election by the people. He sounds like a good one.
This makes the most sense of the other previous posts I read. From what I read about this man's background, it would not suprise me also if he takes a post within the government that involves national education benefits to Iraqis.
As far as death threats and assasination, I have little doubt after suffering 10 years of torture and his possible demise at any moment that he would really be scared to take on the Prime Minister post.
He is respected as an educator and it seems the love of his life. Politicians are a different category of personality.