Wow, alot of partisan hot air here. Fun.
All statements pertaining to Iraq of "war on terror" then "WMD" then "regime change" then back to "WMD" were public relation masters parsing a complex multi-threaded policy into media digestible, bankable story. Anything else is disingenuous, US has as much interest in Iraq as Venezuela.
The "invasion" was part of a much larger administrative policy set out to achieve all sorts of things, but primarily to distinguish R's from D's, facilitate a governmental personnel bloodletting and restocking in line with R conviction, turboboost economy and check EU growth and independence and send a tremendous message to Saudi Arabia. The gravy was to begin to address Bush's 2000 election slate of energy independence (remember that, drilling in protected wilderness of Alaska and Yukon?)
I think it is fundamental to imagine the importance put by R's in 2000 after losing popular vote to a cementitious, boring, grandiose leftover of a wishy-washy adulterator. How can we as a party distinguish ourselves from them. Develop a monstrously controversial policy that has a with us or against us element, compared to Clinton's "nobody should doubt our firm resolve..." Allowing years of easy continued parsing of D and media attacks of otherwise poor governance.
The Saudi Arabian Royal Family seems to be losing it's iron grip. This is of great concern to US as Saudia Arabia owns something like 30% of the US, from banks to brokers to real estate to outrate cash. It may be true that released evidence shows terrorist financing had an SA connection, but a weak, diluted monarchy that holds so much financial power in the US needed to be shown what can happen to them. Iraq happened to offer a convenient bully to exercise on. BTW, in my extreme cynicism I wonder how much cash SA has paid underwriting the Iraqi invasion.
The only grandeloquent statements from US politicos and talking heads that may actually have something to do with a war on terror was the action in Afghanistan. Which the US did not have much trouble garnering international support for, direct and indirect, including the UN. And seems that overall a good job was done, history will tell. I believe thinkers around the world saw that it was pretty bloody obvious Bush and cronies invaded Iraq solely for internal US Republican partisan purposes, and did an amazing job of not saying so nor being sarcastic but just saying no, we won't help your internal affairs, but we'll help Iraqi people after you succeed.
What really bugs me is the preaching about bringing democracy. The way I see it, it's rather like your grandmother asking if you like the sweater she gave you for christmas. Regardless of what you think and do with the hideous sweater, there's only one answer.