In case you were wondering, Senate Guru already has projections for the Republicans up for re-election in 2010. SG writes:

Over a year ago, I took a first glance at the 2010 races, which feature 19 Republican-held seats up compared with 15 Democratic seats.  Among those up for re-election are 8 Republican Senators who will be at least 70 years old on Election Day 2010, compared with only 4 Democratic Senators.

Looking at the projections, many of these races already look very favorable. We have a lot of talent and they have a lot of old candidates.

What is even more exciting is what the quality of the 2010 crop means for the chances of a Democratic super majority in the Senate by January 2011. If we can pick up 4-6 seats this cycle, which is by no means assured, we would be within shouting distance of a super majority. Then we can talk seriously about Medicare for all, a slate of social safety net programs, and Keynesian spending on infrastructure that will ensure prosperity for many, many, many years to come.