The estimation method used in that link (provided by Amos) is a bit too creative for my taste (creative in a very verbatim sense too).

But the numbers game here is stupid from both sides: Someone with left leaning has to believe the highest estimate available, someone with right leaning has to believe the lowest estimate available, both of course irrespective of the methodological quality.

But you may want to read an interview with someone who has changed his mind.

I Don't See Anything Good That Has Come from this War (Interview with Lawrence Kaplan)

(Just BTW, J.R. would be overjoyed by the designation of both Obama and Clinton as neoconservative; but that is only a minor part in the interview)

Wolfgang