"Meet Barack Obama One-on-One". You could book Obama for one price and then book a rich guy on the other end for more and make a million or two yourself. Maybe even book Obama for 1 hour and then book 5 people during that time so as to maximise your own gains.

Say you pay $2 Million to book Obama for 1 hour and then sell 12 minutes each to 5 people for $1 Million each making $3 Million pre-tax. You book and pay Obama only when you have recieved money from the rich customers.

This can actually be made with A celebrities as well. It does not have to be a President only, but I guess a President has more stature than say Britney Spears.