For various reasons, such as the recent Barron's article that looked at money, donor patterns, and how they lined up with prior election results, the MSM over-hyping the "Democrat Momentum", and sullen Republicans who poll poorly, but will pull the lever for the GOP tomorrow, I predict the Republicans will hang onto both houses by the skin of their teeth.
It will be presented as a "wake-up call" for the GOP, and the MSM will try to spin it as a "mandate" for bi-partisanship and "compromise", however, it'll be one more nail in the coffin of the DNC/MSM alliance that's controlled American politics from 1960 up until 2000. If they can't capture at least one house in what's probably their most fertile political ground since Watergate, they may never do it again this generation or even the next.
When you factor in that on average conservatives out-breed liberals, that the GOP has held the advantage in sub $1000 individual donations for several election cycles now, that the GOP has largely "won" the latest round of redistricting fights, and the continued decline of the left-MSM, any gains that the Democrats make in '06 or '08 will be temporary at best.
Even if I'm wrong about tomorrow, I still predict that "bright spots" aside, the Democratic party will be in the doldrums for the next 30-50 years or so, just like the GOP was from 1945-1994&
Here locally in WI. I predict Mark Green will win the Governorship, as will enough of the Republican Controlled Assembly and Senate to pass CCW, tax reform, and Voter ID bills in the next sessions.
I also predict that WI's '(anti) Gay Marriage Amendment' will pass.
I prove the authenticity of my predictions by NOT editing this post.