The NIE is the National Intelligence Estimate.
And it shows the serious dissents by the State and Energy Departments on the claims of WMDs. From the accompanying article:
The CIA's 25-page unclassified summary of the NIE released in 2002 did not contain the State or Energy Departments' dissent.
See pp 8-9 and 14 of the NIE contained in the following link:
https://news.vice.com/...
And on the fact that very few congressmen bothered to read it before voting on war:
http://www.cnn.com/...
7:13 AM PT: Anyone should feel free to repost this in a diary that is more descriptive and explanatory. I just didn't have the time.