A little-known group said on Friday it was behind the killing of an aide to Ayatollah Ali al-Sistani, Iraq’s top Shi’ite cleric and a main driving force behind the Jan. 30 elections, according to an Internet message.”With the help of God, a detachment from Ansar al-Islam Group was successful in killing Mahmoud Madaen — an aide to the polytheist Sistani — who was a leading supporter of the elections,” said the message, posted on Islamist Web sites. Cleric Madaen was killed on Wednesday in a town south of Baghdad, along with his son and four guards.Full Story