Civil Wars: Yours and Mine

Sen. Joe Biden yesterday announced he'd found a civil war into which he was eager to inject U.S. forces:

Biden calls for military force in Darfur

Now, of course, a foolish consistency is the hobgoblin of small minds, but can anyone explain how Sen. Biden could coherently and simultaneously believe that U.S. military force will break the cycle of violence in Darfur, but cannot hope to do so in Iraq (whereas announcement of a partition will)?