politicians only react to the public consensus, we in the west as taxpayers and voters could change it almost overnight - if their was a will :-/
I don't see how it can be reasonably suggested that any proposal in this regard could gain realistic traction.
The problem lies not wholly in the self-interest exhibited by the West but more squarely with the incompetent and corrupt regimes in the very countries suffering in the way being discussed.
you're right zulu - we'd never vote for the guy who made ending world poverty a priority - what about our taxes? our schools? our demands and needs? sadly we almost always put ourselves first - i'm no different, but i can dream can't i? 
That's the whole point about democracy, bj. We vote for people who we believe will look after our interests. We seek to root out corruption (see the expenses scandal) because we genuinely want to governed by people we can trust. The problem in the Third World is that even though the populous at large know how corrupt their leaders are, there is often no way of getting rid of them. If we, in the West, get involved we are accused of racism/imperialism/colonialism. I pity the poor people of Zimbabwe, but what can we do? Mugabe is a tyrant; I would hazard a guess that most Zimbaweans agree, but we are powerless to do anything about it.
