The CIA and State Department have been leaking information to the press and selected members of Congress to undermine the White House since the run up to Iraq. At this point it's hard for me to believe that there aren't multiple people involved or even that this is just partisan politics.
The CIA 'hired' Wilson to spy on sales of 'ore' from the President of Niger to Saddam.
TWICE, they hired him. Each time they discarded policy and law, allowing Wilson to skip the disclosure contracts.
The reason Joe was selected was at the suggestion of his wife (here one must speak Venusian to realize that means she offered the bribe money to her boss, and he took it), and the fact he was going to Niger on company business.
Joe's company was down in Niger brokering a sale.
Guess what of and for who?