LAS VEGAS, Aug. 10 -- President Bush exploited the attacks of Sept. 11 for political advantage, sought to manipulate the markets to suit his ends and cannot combat corporate scandals because of his own business background, Democratic National Committee Chairman Terence R. McAuliffe charged here today in a harsh opening to the November midterm elections. McAuliffe said that, after Sept. 11, Bush failed "to transcend partisanship" and squandered a mandate for bipartisan action by failing to lead on the economy, health care and the environment. "Step aside," he said to Bush, "because a Democratic Congress is coming in 2002 and...