The last set of national generic ballot readings (other than perhaps a Rasmussen poll today) is in. They range from dead even to R+13, with a large clumping right in the middle, around R+6. The Democrats' only real hope to hold the U.S. House is if (a) the polls that have the race within about 4 points are the most accurate, and (b) there is continued movement toward the Democrats in the final day of the campaign.
[After I had prepared the figure, Gallup came in late Sunday night, instead of its usual Monday, with the Republicans up 15, 55-40. It may happen, but I'd be shocked if the GOP's aggregate popular vote for the House exceeded the Democrats' by 15 percentage points.]