Nate Silver's early reading of the 2010 senate races:
I don't think it can be taken for granted that Democrats won't keep their "filibuster-proof" majority, or even expand upon it; I might put this possibility at something like 25-30 percent, following the Dorgan/Dodd retirements. On the other hand, the Democrats might also lose five, six, seven seats … or perhaps more. I don't think the possibility of their losing their majority rates as higher than a small, single-digit number, although it cannot totally be ruled out if unexpected events (incapacitation of Robert Byrd and/or Daniel Inouye, a party switch from Joe Lieberman and/or Ben Nelson) come into play.
The Dish 