Which would mean Petraeus will be played by Catherine O'Hara

A great mystery which has been bothering your blogger for the last 2 days has been solved. Who does US Ambassador to Iraq Ryan Crocker sound like when he's in that weird detached monotone voice mode, which seems to be his main mode?

He sounds like Mitch Cohen, from A Mighty Wind. Unfortunately teh Google doesn't find any Mitch voice excerpts but here's his famous duet with partner Mickey. Not hard to imagine Crocker supplying the vocals in Mitch's stead.