WASHINGTON - The latest NBC News/Wall Street Journal poll might sound like a broken record, but the tune grows louder as congressional midterm elections get closer and closer: President Bush is once again facing the lowest job approval rating of his presidency, the lowest percentage of Americans who believe the country is headed in the right direction, and an electorate that greatly prefers a Democratic-controlled Congress over a Republican-controlled one. Yet the poll also shows something else that goes beyond the November midterm elections: A strong majority believes Bush is experiencing a long-term setback from which he’s unlikely to recover....