Why does the smartest man in any room need any debate prep, I wonder?

The Obama campaign has announced the Senator John Kerry is going to fill in as Mitt Romney for Obama debate prep.  They will have to do this debate prep in separate rooms as I do not think both of their heads will fit in any standard room.

Plus Kerry is rich so Obama can sneer as he spouts class warfare rhetoric.  Kerry won’t really take offence at this because he married his money, Romney earned his.