Although on the surface it looks like you had Amb. Wilson and his current wive, Val Plame, running an anti-Administration CIA operation, my money's on it being more of a "private thing" which has been worked in collusion with Grassley and possibly another Senator who has a financial interest in whatever it was Wilson was up to.
Other Freepers have posted quite a bit of material already about the possibility Wilson was involved in peddling yellow-cake to Saddam Hussein, and this bit about Grassley and the FBI investigator appeared in a Washington Times article the other day.
Those who've followed me on the Anthrax Attack know I've had my suspicions about Grassley all along.
Grassley was one of the senators who wanted to let Saddam keep Kuwait back in 1990-91.