Please keep your priorities straight. Even by the largest estimates, those of the UN, far fewer citizens have died in Iraq than in Sudan. In Iraq, we are responsible, in Sudan, others are. We must first stop our killing before we can proceed to not seem like murderous hypocrites by stopping the Sudanese government.
Of far lesser concern is that the Darfurians want to secede, and the Bashir government wants to maintain Sudanese unity. In every friendly government, like Iraq, America demands territorial integrity. What is going on is not what it seems. The Christian Right is hammering for this war for their own religious purposes. The oil companies wouldn't mind this war. The defense contractors love war. The military is pretty busy right now. The neo-cons wouldn't mind this war at all.