May 2003: Wilson joins Kerry campaign.
July 6, 2003 Joe writes his article.
July 2003-2004: Kerry lives off Wilson's Niger story AND the Plame outing in an anti-Bush campaign.
July 9, 2004: Senate Intelligence Report
Late July: Berger fired
Later in July: Wilson fired.
I think I remember that Berger first burgled on June 28, 2003 but would have to look it up. It was kept silent for one whole year and then "leaked" according to Berger's attorney.
For you point that's th the key set of points, but for an overall timeline, the earlier editorial that Wilson wrote proclaiming how dangerous Iraq was should be included.