Charlie Cook's final predictions are in. He sees Dems picking up 20-35 House seats and 4-6 Senate seats, and he doesn't think much of assessments which say the race for Congress is tightening:

Going into Election Day, we see a 20-35 seat gain for Democrats in the House, a four to six seat gain for Democrats in the Senate and a six to eight seat gain for Democrats in the governor's races.

All Monday there was considerable talk that the national picture had suddenly changed and that there was a significant tightening in the election. This was based in part on two national polls that showed the generic congressional ballot test having tightened to four (Pew) and six (ABC/Wash Post) points.

Seven national polls have been conducted since Wednesday, November 1. They give Democrats an average lead of 11.6 percentage points, larger than any party has had going into an Election Day in memory. Even if you knock five points off of it, it's 6.6 percentage points, bigger than the advantage that Republicans had going into 1994.

Stuart Rothenberg, meanwhile, is predicting Dem gains of 30-36 House seats and 4-7 Senate seats. We'll see who's right tomorrow.