The New York Times has a review of the Democrats’ early opening of the 2008 Congressional campaign. Aware that the shift of the majority was a very narrow thing, senior Dems are already about getting their freshmen Congressional Members ready for rematches through a variety of tactics.
The article also identifies Senators Landrieu of Louisiana, Johnson of South Dakota, and Mark Pryor of Arkansas as the most vulnerable of the the Democratic incumbants. (Johnson would have been vulnerable even before his illness, especially if Governor Bounds decides to make the race.)
Republicans need very much to get as organizaed as the Democrats are, beginning with candidate recruitment for House races and especially these three Senate races.