It's been called the world's worst humanitarian crisis. Before Senator Obama left Africa, he wanted to see what was happening to the people of Sudan's Darfur region firsthand.

He traveled to a Sudanese refugee camp where he met families who had been terrorized by Arab fighters known as the Janjaweed. In Darfur, the Janjaweed have been slaughtering black civilians for more than three years. Some have called it a genocide. More than 400,000 people have been killed and millions more are without food, water and shelter. To escape the murderous rampage, millions have fled to refugee camps in Chad, near the Sudanese border.

At the Me-el refugee camp, which shelters more than 15,000 people, Senator Obama met a woman who lost 10 family members during a Janjaweed massacre.