Well, I base that comment on the recently elected President of Iraq, when he was here in the U.S. recently, and he said very plainly that most of the terrorists they are fighting in Iraq are non-Iraqi's, like zarkoui, mostly syrians, iranians, egyptians, jordanians, saudis, etc. I'm sure there are many radical hussein supporters among the ranks, but just like most of the remaining terrorists in Afghanistan are not Afghani, I think the same might well be true in Iraq. There sure aren't a small number of foreign terrorists involved in the attacks in any rate.
"Well, I base that comment on the recently elected President of Iraq..."
Unfortunately, politicians aren't always the best source of military intelligence. If you check out the link you might find some additional sources to base your opinion on. It's important to know our enemy. The bulk of the Iraqi army disappeared into the population shortly after the invasion and I have to wonder what they're doing now.