Well, yesterday the WH said that the Libyan violence was a terrorist act after all ... while Obama was still saying, on Letterman that night, that it was all about the video. Lack of communication there? Betcha there were more people listening to Letterman than to Carney.
However, Carney is still not saying it was pre-planned ... duh? was my general impression that a terrorist act required some pre-planning by its very nature.
I can't remember, correct me if I'm wrong, when a sitting President ever did a late-night talk show gig.