“About my differences with Ron Paul: I am not a social and economic Darwinist. I believe government has an important role in providing education, regulating polluting industries, and prohibiting racial discrimination in housing, employment, and public accommodations. I also believe the U.S. needs to provide international leadership in preventing the most catastrophic impacts of climate change — and do it urgently. I am a firm supporter of international efforts, with U.S. support, to stop genocides, as we committed to do after confirmation of the Genocide Convention. Ron Paul is on completely the other side on these issues. Do his supporters really believe that the prohibition of racial discrimination is a violation of individual liberties? Should we have just sat on our hands while 800,000 Rwandans were butchered in 100 days — or supported U.N. action to stop the slaughter? Do our fundamental moral commitments end at political boundaries? And does anyone really think we shouldn’t be working cooperatively with the international community to stem climate disruption, achieve energy independence, and to be far better stewards for our children and later generations?”