I'd question whether that is actually true, aken. It just doesn't match with my memory, nor with the cursory look at a couple old threads I've made.

I'm pretty sure that the main arguments I had at that time with people who favoured the invasion (and there were a good few) were with people who would not see themselves, or be seen by others, as "liberal". In real life too - about the only "liberal" I can remember talking to who favoured the war was our then Labour MP.

I'm sure there were plenty of people indicating they didn't like Saddam, but that's not the same thing. And of course, in both the UK and the US the supposedly "liberal" opposition was mostly in favour of the war. (Not the Liberal Party itself, which makes for confusing terminology.)