A poor, black man. Certainly not...
This is a strange thread.
Well the Bush family were Skull and Bones men, and Obama has already been inaugurated at the Masonic Hall in NY. What is the Bulingdon Club but another fraternity? They all run along the same kind of lines. Cameron would have probably invited him to join as a gesture of their fraternal associations.
of course obama would not have been invited to join the bullingdon. he's not an upper-middle-class or aristocratic brit - not even commonwealth. he's just a foreigner.