"Al-Jaafari spent more than two decades in exile, mostly in Britain and Iran, helping to lead anti-Saddam opposition forces in the Islamic Dawa Party, Iraq's first Shiite Islamic political party. He also has close ties to Grand Ayatollah Ali al-Sistani, Iraq's most influential Shiite cleric. Al-Jaafari's wife is a distant relative of al-Sistani's."
http://abcnews.go.com/International/wireStory?id=648709