Summary of the candidate's response:
McCain talked about how American and peace loving people are tired of saying Never Again. Unfortunately, action is being blocked by China, so we need to sit down with other peace loving countries to end the genocide. Specifically, his answer focused on providing logistical support and funding for the peacekeeping force in Darfur.
The moderator then asked a followup question - "Would a McCain presidency over the last 7 years have done more about Darfur than the Bush presidency has." McCain responded 'yes'. He says that he would have made it a bigger priority for his presidency. He would have shamed China for its failure to help, and he would have made louder appeals to other countries to act.