Millers second source for Plame?

[Jemmons]

this is from a Q&A about
http://www.npr.org/templates/story/story.php?storyId=4751084

Hold on -- so Miller had a second source she was protecting, beyond Libby?

That's what Miller seems to be saying. A recently discovered notebook belonging to Miller contains a misspelled version of Plame's name. But she also says she can't remember who that other source was. What makes that assertion so astonishing is that her lawyer, Robert Bennett, negotiated a strict agreement with Fitzgerald that she would only be asked about her one confidential source in the case -- because, Bennett promised, she only had one source who could shed any light on the Plame/Wilson matter. It would appear her account in the Oct. 16, 2005 Times contradicts that promise. And her failure of memory under oath before a federal grand jury is something other journalists would likely question quite sharply in a government official.

Did it become any clearer who the second source is?