I recall that Cheney and Rove were ruled out, as they were not on that trip.
Here's a string at TPM that seems to make Condi the source for that particular Plame outing/smear:
DID CONDI PUSH THE "WILSON'S WIFE SENT HIM STORY"?
By daxman
From: Top Reader Blogs
http://www.tpmcafe.com/story/2005/7/20/16340/8649Press gaggle transcripts show that it was Condoleezza Rice, not Ari Fleischer, who was pushing the press to look into the reasons the CIA sent Wilson to Niger. Jul 20, 2005 -- 04:47:22 PM EST
As it has been discussed, Fitzgerald’s office is keenly interested in the State Department memo, distributed in the days leading up to the Novak article, disclosing that Wilson’s wife had something to do with sending Wilson to Niger. The LA Times July 18, 2005 story discusses how there is interest in whether Ari Fleischer was pushing the story to reporters before the Novak article appeared.
The LA Times July 18, 2005 articles ends with:
“And Fleischer also seemed attuned to a strategy of discrediting Wilson. Two days before Novak revealed Plame's identity, Fleischer questioned the former envoy's findings in remarks to reporters during a trip with Bush in Africa.
The transcript of that press gaggle (the term for an informal question-and-answer between reporters and the White House spokesman), which took place in the National Hospital in Abuja, Nigeria, has been requested by the prosecutors.”
The transcript of the July 12, 2003 press gaggle reveals no reference to the Wilson matter. Fleischer may have been pushing the story in his July 7, 2003 gaggle. (See text of his Wilson reference in the July 7, 2003 gaggle below). But a key exchange on the Wilson trip did occur in the July 11, 2003 press gaggle aboard Air Force One with both Ari Fleischer and Condoleezza Rice and it wasn’t Ari pushing the Wilson story.
The transcript of the July 11, 2003 press gaggle has this interesting exchange:
Q Dr. Rice, when did you all find out that the documents were forged?
DR. RICE: Sometime in March, I believe. Is that right?
MR. FLEISCHER: The IAEA reported it.
DR. RICE: The IAEA reported it I believe in March. But I will tell you that, for instance, on Ambassador Wilson's going out to Niger, I learned of that when I was sitting on whatever TV show it was, because that mission was not known to anybody in the White House. And you should ask the Agency at what level it was known in the Agency.
Q When was that TV show, when you learned about it?
DR. RICE: A month ago, about a month ago.
Q Can I ask you about something else?
DR. RICE: Yes. Are you sure you're through with this?
SNIP