Can Obama keep Sudan from exploding after its referendum?

Looking back on his presidency, Bill Clinton has often expressed regret over his administration's failure to stop the genocide that ravaged Rwanda in 1994 and cost 800,000 lives, even referring to it as a "personal failure" on his part. And President George W. Bush, who labeled the mass killings in Darfur in 2004 as "genocide," has voiced frustration over his inability to persuade the United Natio