Charlie Cook continues to think it will be a very bad election for Democrats:
The potential is here for a result that is proportional to some of the bigger postwar midterm wave elections. These kinds of waves are often ragged; almost always some candidates who looked dead somehow survive and others who were deemed safe get sucked down in the undertow. That's the nature of these beasts. But the recent numbers confirm that trends first spotted late last summer have fully developed into at least a Category 3 or 4 hurricane.