The Democrats have the Senate Majority, we all know that. However, it is such a tiny majority and the Republicans will only need a net gain of 1 seat to tie up the Senate and 2 seats to retake. With that said, could the Democrats lose their Senate majority in 2008?
Well of course it is a possibility, but I think the exact opposite is far more likely if you look at the numbers. Of the 33 seats up in 2008, Republicans are defending 21 and the Democrats just 12. At first glance it appears the Democrats only have 1-3 seats to worry about at the most while the Republicans have at least half a dozen that will be competitive. The numbers this cycle definitely favor the Democrats.
But then again, which seats are and are not competitive at this point completely depends upon retirements on both sides, so it is too early to say for sure which seats will be in play.
Of course, there are at least two possible Democrat pickups in the Senate in Oklahoma (Jim Inhofe's unpopularity) and Mississippi (Thad Cochran's possible retirement). Of the 33 seats up in 2008, I see 31 seats as being potentially competitive with the only two not Idaho and Wyoming.
Colorado is strangely absent from your list - that is by far our best pick-up opportunity if Allard retires or not. Democrats have a deep bench of candidates against a vulnerable Norm Coleman as well.
I just said, at least two possibilities. Colorado and Minnesota are definite possibilities and I should have included those, but Oklahoma and Mississippi can and will be competitive.