Ahmed Wali Karzai, half-brother of Afghanistan's President Hamid Karzai, was shot to death today by an associate so trusted he was allowed to bring a pistol into Wali Karzai's home in Kandahar. Karzai's bodyguards immediately killed the assassin, Sardar Mohammed. Matthieu Aikins, who writes for Harper's, Foreign Policy and other publications, joins us from Kabul.
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