Well, new voter registration statistics have been released, and so now we have the evidence to back up that speculation. This is an over-generalization, but broadly Obama is indeed turning out new voters, whereas Romney is turning out the same old voters.

In total, 324,780 people voted in One-Stop Early Voting on Thursday and Friday. Of those, 42,709 were brand new previously unregistered voters. They did not pass any poll's "likely voter" screen, nor did they even pass any poll's registered voter screen. And yet, they voted. And it is clear that they voted overwhelmingly for Obama (probably by about 2 to 1).

Here's who those 42,709 brand new voters are:

Party Registration:

Democrats - 20,792 (48.7%)
Republicans - 8,699 (20.4%)
Libertarians - 604 (1.4%)
Unaffiliated - 12,614 (29.5%)

Race:

White - 19,041 (44.6%)
Black - 13,470 (31.5%)
American Indian - 510 (1.2%)
Hispanic - 2,706 (6.3%)
Other - 9,688 (22.7%)

Gender:

Male - 19,077 (47.0%)
Female - 20,055 (53.0%)

Total - 42,709 (100%)

Now why is this significant, you ask?

Because it means that Obama is adding to his final vote total in early voting, whereas Romney is just moving some of his votes from Election Day to now, without actually increasing the total number of votes he will receive by nearly as much as Obama.

That's the difference between finding $5 lying on the street, and moving $5 from your left pocket to your right pocket. Only the first transaction actually makes you richer.

Now, how do those 42,709 new voters look on a map?

In a word, very blue. This map shows the % of the 42,709 new voters in each county who registered Democratic, as a share of those who registered D or R (not counting Libertarian and Unaffiliated):