Iraqis on Mission to End Najaf Insurgency BAGHDAD, Iraq - Iraq's national conference sent a delegation bearing a peace proposal to Najaf on Tuesday, hoping to end the standoff with radical Shiite cleric Muqtada al-Sadr, which has marred the gathering meant to be a landmark step toward democracy.    As the National Conference in Baghdad put together the mission, a mortar round exploded several miles from the gathering's venue, killing seven people and wounding wounding 35, according to the Health Ministry...