Did White House Spy on Christiane Amanpour? Why Did NBC Delete Mention of it?

Reports are flying on the blogosphere at the moment about a self-edited portion of this NBC interview with NY Times reporter James Risen, who broke the NSA story.
According to liberal blog Eschaton, who reported this early, the original transcript contained the following passage; the bold portion is now allegedly missing.

Mitchell: Do you have any information about reporters being swept up in this net?
Risen: No, I don't. It's not clear to me. That's one of the questions we'll have to look into the future. Were there abuses of this program or not? I don't know the answer to that.
Mitchell: You don't have any information, for instance, that a very prominent journalist, Christiane Amanpour, might have been eavesdropped upon?
Risen: No, no I hadn't heard that.