The answer is that the Senate is competitive – but barely. There are seven Senate seats that Republicans have an excellent shot at winning. After that, the going gets very tough. Still, there’s at least some chance that Republicans can pick up the additional seats needed to get them to 50, which would give them at least partial control of the Senate. The odds are long. But at this point in 2006, no one thought Democrats could retake the Senate, and at this point in 2008 no one thought a filibuster-proof majority was even plausible. Let’s go through the Republican seats up in 2010, and then address the Democratic seats in more detail.