BAGHDAD, Iraq - Gunmen killed a senior official in Iraq's largest Shiite political party Monday in a drive-by shooting in Baghdad, a party aide said. Shahir Faisal Shahir was shot while traveling to his office, said Haitham al-Hissaini, a top party adviser for the Supreme Council of the Islamic Revolution in Iraq. Shahir carried the rank of major general in the party's militia, which is known as the Badr Brigade. The militia fought the former regime of Saddam Hussein. The Supreme Council of the Islamic Revolution in Iraq is the country's biggest Shiite party and maintains close ties to Iran....