More bad news for Congresswoman Gabrielle Giffords, who represents a swing district in Southern Arizona's CD8. Charlie Cook of The Cook Report analyzes the latest polls:

Among all voters, there has been a significant swing since 2008 when Democrats took their new majority won in 2006 to an even higher level. But when you home in on those people in this survey who are most likely to vote, the numbers are devastating. The NBC/WSJ survey, when combined with a previously released NPR study of likely voters in 70 competitive House districts by Democratic pollster Stan Greenberg and Republican Glen Bolger, point to an outcome for Democrats that is as serious as a heart attack. Make no mistake about it: There is a wave out there, and for Democrats, the House is, at best, teetering on the edge.

To be sure, things could change in the four months between now and November 2. The GOP's failure to get Republicans to vote in the May 18 special election in Pennsylvania's 12th District underscores that the party can't just sit back and await spontaneous combustion in terms of turnout. Still, 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.

Read the whole thing here.