If the election is, as the MSM says, "unpredictable," you can bet the Republicans are going to pick up seats. Again.
The Democrats will not pick up seats (only a few based on local issues) because of their behaviour concerning national security. They have publicly said they would withdraw troops (lose yet another war), impeach President Bush, get rid of the patriot act, raise taxes and treat terrorism as a law enforcement problems (as Clinton did thus laying the groundwork for 9-11). I don't like what the Republicans do sometimes, but I despise the Democrats and would not consider voting for one.