"We know he's got ties with al-Qaida. A nightmare scenario, of course, is that he becomes the arsenal for a terrorist network and they could attack America,"

This has been proven correct.

"Today, the gravest danger in the war on terror, the gravest danger facing America and the world, is outlaw regimes that seek and possess nuclear, chemical and biological weapons,"

This is probably correct.

"If Saddam Hussein won't disarm, for the sake of peace, for the sake of a future for our children, we will lead a coalition of nations and disarm Saddam Hussein,"

Did that.

Powell before the UN: "We KNOW this" (talking about Chem-Bio weapons)

Yes, we did know some things: Saddam did use chemical weapons, and UN inspector found and distroyed some WMD.

http://www.emergency.com/japanatk.htm
Nerve agents are in the stockpiles of several nations, and it is suspected that they may be possessed by several terrorist groups. They are an insidious way to injure or kill a large number of people in a rapid, painful, and gruesome manner. All methods of public transportation, and areas of public gathering are vulnerable.
An ERRI analysis of the incident(to the time of this report), suggests that the symptoms reported by unofficial sources, thus far, are not consistent with the nerve agent Sarin. But, that it is difficult with the limited amount of information that is currently available to firmly establish the chemical that was involved. Additionally, a chemical analysis of the scene should confirm the actual chemical used, after the proper tests have been run at a lab.

One thing is certain. If it can be established that a nerve agent was used in Japan, the extremist assault on society has intensified by another deadly degree.