In May 2003, after his mission to Niger but before his July 6, 2003, Times op-ed piece, Mr. Wilson began working for Mr. Kerry as an unpaid adviser, offering foreign policy advice and speechwriting tips.
So Wilson joined up with Kerry in May, 2003? That makes it easy. Wilson wrote his NYT article on his Niger junket to spear Bush's WMD policy and consequently assist Kerry. But when his wife's CIA job was revealed, he switched targets and went after Rove - which would also be a big assist to Kerry.