I've made the point in the past that only 33% of the American people supported the invasion of Iraq without UN authorization, and my source for that is here. The right wing war mongering American Enterprise Institute has compiled the results of various polling questions regarding the war and that is available here. It's interesting to note that the AEI basically confirms my prior claim. But the AEI has an additional question that is worth considering, which is on page 6. Would you support the invasion of Iraq without UN authorization but with the support of one or two major allies? Since of course Britain did support the invasion (despite public opposition) this question more accurately reflects what happened. The results were as follows:
Jan. 3-6, 2003 PSRA/Newsweek - Support: 47, Oppose: 45
Jan. 16-17, 2003 PSRA/Newsweek - Support: 39, Oppose: 52
As you would expect more people did support war with the support of a couple of additional states but without UN authorization than supported with the US acting alone.
But what makes this all the more remarkable is that 2/3 of the American people were under the false impression that Saddam was directly involved in the 9/11 attacks. According to the University of Maryland 69% believed this falsity. Despite this they opposed Bush's invasion when it occurred. After it commenced though the public did rally in support as the public typically does in such cases.
My memory is that Bush did not explicitly state that Saddam was responsible for 9/11 or had links to Al Qaeda. But did he intentionally conflate Saddam and OBL, such as during the 2004 debates when he "accidentally" said one when he meant the other? As is well known, Foxnews viewers are more likely to have pro-war misperceptions. They would be expected to get a more steady diet of such conflations.
Well, that's impossible to prove and speculative. But it's interesting how tepid support was despite the widespread belief that Saddam had attacked the US.