CNN Opinion Research Corp. survey finds fewer Democrats think attack imminent . Percentage who expect attack is lowest since the last two years . Survey also finds strong opposition to U.S. war , current troop levels in Iraq . Numbers could indicate challenge for Sen. McCain presidential campaign .
CNN/Opinion Research Corp. survey finds fewer Americans think attack imminent . Percentage who expect attack is lowest since September 11 , 2001 . Survey also finds strong opposition to Iraq war , current troop levels in Iraq . Numbers could indicate challenge for Sen. John McCain 's presidential campaign .