It's unfortunate perhaps, but someone who seems consistently to be pushing this issue of a lack of democracy at the global level is Gaddafi.
I can't find his 'call to global democracy' but he makes some pretty solid criticisms of the international system.
> He said the U.N. General Assembly, at which virtually all of the world's states are
> represented, should be the executive body of the global organization, not the
> smaller Security Council.
> "Why are we asking for democracy in countries, when there is dictatorship in the U.N.?"