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No one in Syria expected the anti-regime uprising to last this long or be this deadly, but after around 70,000 dead, 1 million refugees, and two years of unrest, there is still no end in sight. While President Bashar al-Assad's brutal response is mostly to blame, the opposition's chronic failure to form a viable front against the regime has also allowed the conflict to drag on. And there's one anti-Assad group that is largely responsible for this dismal state of affairs: Syria's Muslim Brotherhood.