Article about a study regarding position on the war and knowledge about the facts of the war:
http://www.sklar.com/texts/gulf-war-media
Here's the main conclusion:
"...our study revealed a direct correlation between knowledge and opposition to the war. The more people know, in other words, the less likely they were to support the war policy. The argument we are making here is not based on politics, but on statistics. We are not saying that people against the war are right and those in favor of it are wrong, merely that since our study shows a clear relation between between knowledge and opinion..."