Okay, we'll keep it simple.

Here, from Pew, are preemptive results to the election.

http://pewresearch.org/assets/publications/1787-1.png

Here we can see that, while there is a skew in the results, taking the average of these polls would lead one to assume that there will be a victory for the Republicans. However, I may add that there are so many toss-ups between both houses, that this surely will be an interesting election. Who knows whether or not voters have even made up their minds yet.