Here is something that might "alarm" the left a little?

Nearly two thirds of registered voters showed a high level of interest in the election—the highest ever recorded in a midterm election since the Journal/NBC poll began asking the question in 2006.

Although Democrats are preferred in the national poll overall, their advantage has vanished in the House districts that matter most. In districts rated as the most competitive by the nonpartisan Cook Political Report, the parties are dead even on the question of which one should control Congress. In last month’s poll, Democrats led by 13 percentage points among registered voters and six points among likely voters.

This mirrors a poll last week from the Washington Post and ABC News. Their poll put Democrats up 11 points on the generic ballot, but Republicans at +1 in the 66 battleground districts, also a big swing from their earlier polling. That suggests that Democratic enthusiasm intensified in districts where they were already safe, and that Republican enthusiasm has changed the election where the House majority will be determined.

So a couple of points here:

One obvious point is that these two polls were at the overall "high end" of the spectrum for the Democrats with the plus nine and plus eleven. If you consider that there may be an overall swing of around ten points between the top line number and the battleground district number, then it would be logical to expand that to the overall collective average of all generic ballot polling. Right now, that average sits at between seven and eight percent. This would suggest that while the Democrats hold a larger lead "overall" that Republicans might be two or three percentage points up in the battleground districts.

On the flip side, the 2018 battleground districts are being identified as more Republican than would have been seen as battleground in recent elections. In other words, it makes perfect sense that the numbers would be close. That is what makes them the battleground districts. Looking at the Cook Report, the Democrats would need to win about twenty four of the sixty six battleground states to win back the House (or about a third of them). Obviously, when the Democrats were (as they had been) leading by four or five points collectively it looked like a pretty big wave brewing. But if the GOP has taken even a smallish lead in these districts, with a little bit of momentum, then it could be anyone's ball game.

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The only thing we can say for certain is that while there doesn't appear to be as much movement in the top line of some of these polls, there appears to be a noticeable improvement for the GOP in the actual battleground districts. This could ultimately be the difference between a blue wave and purple ripple.