Also in the same category, but with a slightly better chance of surviving, are Virginias Tom Perriello and Glenn Nye, Ohios Zack Space and John Boccieri, Arizonas Harry Mitchell and Ann Kirkpatrick, Bobby Bright (Ala.), John Hall (N.Y.), Mark Schauer (Mich.), Patrick Murphy (Pa.) and Harry Teague (N.M.).
The Republican wave is reaching historic proportions if supposedly less vulnerable Democrats in the same category including North Carolinas Larry Kissell and Heath Shuler, Connecticuts Christopher Murphy and Jim Himes, Gerry Connolly (Va.) and Walt Minnick (Idaho) also fall on Election Day.
The second category includes veteran Democratic incumbents, some of them who have held seats for many years and have successfully personalized their districts. These incumbents are finding their longevity is a problem and their Democratic label a disaster.
Of that group, Reps. John Spratt (S.C.) Chet Edwards (Texas), Paul Kanjorski (Pa.), Ike Skelton (Mo.) and Earl Pomeroy (N.D.) are in the most trouble. In a massive wave, Reps. Bob Etheridge (N.C.), Rick Boucher (Va.), James Oberstar (Minn.), Solomon Ortiz (Texas), Jim Costa (Calif.), Sanford Bishop (Ga.), Gene Taylor (Miss.) and Mike McIntyre (N.C.) could also lose.
Democratic losses are likely to be particularly large in the South and the Midwest.
Significant losses in the Northeast in both New England and upstate New York, and in traditionally Democratic districts, including by Reps. Russ Carnahan (Mo.), Ciro Rodriguez (Texas) and Raúl Grijalva (Ariz.), as well as by Ortiz and Oberstar would suggest gains well over 50 seats.
Districts with large numbers of blue-collar, culturally conservative Reagan Democrats are worth watching. A number of the districts already mentioned those of Dahlkemper, Oberstar and Carnahan fit the bill, as do the districts of Reps. Mark Critz (Pa.) and John Yarmuth (Ky.) and retiring Reps. David Obey (Wis.) and Alan Mollohan (W.Va.).
The magnitude of the GOP victory could be evident relatively early in the evening. If Republicans defeat Democratic incumbents Joe Donnelly (Ind.) and/or Ben Chandler (Ky.), or if North Carolina Reps. McIntyre, Shuler and Etheridge fall, massive Democratic losses are likely.
On the other hand, if Reps. Baron Hill (Ind.) and Jim Marshall (Ga.) pull off upsets, or if either Virginia Democrats Nye or Perriello win, it could well be a sign that the GOP wave hasnt materialized as expected.
Former Sen. Scott Brown, R-Mass., candidate for U.S. Senate in New Hampshire, holds his hand over his heart during the singing of the national anthem as he waits to take the stage for his town hall campaign rally with Sen. John McCain at the Pinkerton Academy in Derry, N.H., on Monday, Aug. 18, 2014.