Should the UN have a Parliamentary Assembly?

Sounds like a good idea to me.
This week several hundred political leaders, among them 378 MPs from 70 countries, have joined to call for the establishment of a Parliamentary Assembly at the United Nations (UNPA). The joint appeal states that, in an age of globalization, citizens need to be vested with a stronger voice in global affairs.
The call is the core of an international campaign which is being launched through a series of events in more than ten countries. More information on the campaign here.