How Scripted Was The Chair?

Bill Maher made the point in last week's Real Time that the kind of improv Clint did at the RNC is extremely difficult to pull off.  Jason Alexander, new hair and all, contested that, recounting conversations with Jerry Seinfeld about how much slack audiences now give him when he does standup.

But it took the Carmel Pine Cone to get the interview with Clint on exactly how improvisational his bit was.  Jonathan Chait has a writeup in New York's Daily Intel.