The crucial premise of the war on Iraq was to secure weapons of mass destruction and the means of producing them. It is now clear that the Bush Administration has failed to do this in the most spectacular way.
http://story.news.yahoo.com/news?tmpl=story&cid=574&e=10&u=/nm/20041014/wl_nm/nuclear_ir
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What we have here is confirmation that nuclear related sites in Iraq that were being closely monitored by the UN inspectors and IAEA were completely IGNORED by the US after the invasion, and of course the Bush Administration refused to let the inspectors back in.
So, under the Bush Administration's watch, their best reason for invading Iraq turns out to have ended into one of the worst single failures of arms proliferation of all. The justification for invading Iraq was precisely to prevent this kind of stuff from being used against the United States. Instead, this administration's gross negligence has resulted in their most important specific war aim turning into the most explicit failure of the entire episode.
This is an issue that the Kerry campaign must hammer Bush on between now and the election. It cuts to the core of Bush's fitness to serve as commander-in-chief. It is an issue that everyone will be concerned about, and it is an issue that will swing moderate Republicans into the Kerry camp.