Maybe they all had dental appointments or something? Todd Stern, US Special Envoy for the Climate Change Hoax: "President Obama, along with any number of other leaders, has not been able to come [to Rio]"

Special Envoy for Climate Change Todd Stern at the Rio+20 United Nations Conference on Sustainable Development

QUESTION: It's Barbara from CNN. If this is so important to the United States, where is President Obama and is he coming?

SPECIAL ENVOY STERN: It is important to the United States, and we are going to be represented by Secretary Clinton. There are many states that are being represented by their leaders and many states that are being represented at a level comparable with the Secretary of State. Our Secretary of State-we have the advantage of having a Secretary of State who is-anybody who is a Secretary of State is a high-level person-but she happens to be somebody who is a world figure in her own right so I think the United States is well represented. And President Obama, along with any number of other leaders, has not been able to come.