The American public is famously divided on almost every issue: from politics to war to the place of religion in society. But in the past five years there is one cause that has united Americans of liberal and conservative leanings and of Muslim, Jewish and Christian faiths: outrage over the ongoing conflict in Sudan's Darfur region. Since former Secretary of State Collin Powell identified the conflict in Darfur as a genocide in 2004, we've been up in arms and out in the streets, demanding an end to abuses by the Sudanese government. But how much has our advocacy actually achieved? And can we accurately call Darfur a genocide? The Takeaway talks to Mahmood Mamdani, a professor of Government at Columbia University and author of the book, Saviors and Survivors: Darfur, Politics and the War on Terror.