Thank you for your observations, CyberAnt. I also believe Mrs. Plame-Wilson is more involved than the public record indicates. As for a possible Clinton angle, I wouldn't argue against that point of view. May I draw your attention back to the start of my article, in the section titled "Background?" Seymour Hersh has a "former high-level intelligence official" in the Clinton administration talking about how the British were spreading disinformation about Iraq in the late 1990's. This source implies that the Clinton administration was actively encouraging the British to do so, if not participating themselves.
Specifically as regards how the Iraq-Niger sentence got into the State of the Union Address, Hersh writes that this source said, "Somebody deliberately let something false get in there," the former high-level intelligence official added. "It could not have gotten into the system without the agency being involved. Therefore it was an internal intention. Someone set someone up." So, according to Hersh, we have a former Clinton administration high-level intelligence official saying bluntly that there was a set up.