even on the eve of the invasion:
http://www.thenation.com/doc/20100405/mitchellThe seventh anniversary of the start of the Iraq War dawned today with very little notice in the media, despite the huge (and ongoing) costs of the war, not the least of which the nearly 4,400 dead US military personnel and at least 100,000 deceased Iraqi civilians. What we have heard from commentators, again, this year is that the United States went to war with the overwhelming support of the public and the press. Actually, this is a myth.
It's true that polls showed that Americans believed Saddam had WMD--and no wonder, given the deceitful propaganda from the Bush administration--and that they backed an invasion if it came to that. But most surveys also showed a clear split between those who wanted to go to war soon, and those who wanted to wait for more diplomacy or to give the United Nations inspectors more time to work (remember, they had found nothing and then were withdrawn by the president).
Another myth: the nation's newspapers on their editorial pages backed the invasion strongly.
I think what happened was there were a lot of loud mouths saying you were a traitor if you didn't back the war and the President, and that bred fear among people to stay quiet. Recall, Michael Moore speaking out against the war at the Oscars and being booed . . . by a Hollywood crowd. Also remember the way the Dixie Chicks were treated. It really was not about the whole country backing the war. It was about the dissenters being silenced.