An e-mail:

Question: How is Karl Rove Novak’s 2nd source, solely by saying “I heard that too”? Is that all it takes to be a source? Hearsay, especially since apparently in all cases, the reporters called the WH aides and posed the questions? How did Novak know that Rove heard that from a source who was different than Novak’s first source? Hypothetically, say that Judith Miller was Novak’s first source on Plame, and Rove “heard that too” from Judith Miller, doesn’t it become even more ridiculous to suggest that Rove was Novak’s second source or am I missing something about how sourcing works?
Have Wilson, Plame, and Corn been asked to testify by Fitzgerald? Does anyone know?

ME: Re Novak’s second source, that’s something I’ve wondered about too. It seems awfully loose sourcing. On the other hand, he got it right, which is all that matters in the end.

I’m not sure re Wilson, Plame, Corn (been out of touch), but someone else in here might know. Cliff’s piece from Friday, by the way, was absolutely fantastic. Excellent journalistic forensics.