Obama won't touch that with a ten foot pole!!! That's his worst nightmare.
If he doesn't have his teleprompter - his 'walkie-talkie' guy that he has plugged in his ear gets screwed up & he stutters & fumbles when someone has not written his speech to read & when his ear piece fouls up & he can't hear what the guy is prompting him to say.
He also would have to answer some audience questions - and since he's trying to stay under the radar - a town hall meeting with McCain is not going to happen.