Election 2024 updates: With Arizona, Trump sweeps all 7 swing states

Sources close to the Harris campaign told ABC News that her team is getting more nervous, but still they believe they can clinch the blue wall and the Nebraska blue dot.

In the meantime, the mood at Howard University has dampened over the last couple of hours. The night started out with music pumping and crowds dancing. Now, there's a giant screen playing CNN and the crowds are muted, with many glued to the screen.

The crowd cheers anytime races are called for Harris and boos whenever states are called for Trump.

Several Howard University attendees told ABC News the results are making them nervous, but they're still cautiously optimistic.

But one Democratic operative just told ABC News, "I am horrified it is close and going to bed."

A Democratic operative in Wisconsin told ABC News the situation is anxiety-inducing but would still "rather be us than Trump." This person says it could be a "late night again. Right now we have Trump holding a red mirage lead before the absentee ballots."

The source's view is that they won't see absentee ballots until later tonight, and they're already beating Biden's numbers in Waukesha County, arguing that the state-wide strategy is paying off: "holding the line in rural areas and accelerating in urban areas. It's the kind of margin you generate through massive door-knocking campaign."

This operative said, "Blue wall has been core strategy all along and it still is."

A couple of non-incumbent Republican women we're watching are in races that have been called.

In Alabama's 2nd, ABC News projects that Caroleene Dobson will lose, and in New York's 18th District, ABC News projects that Alison Esposito will also lose.

Harris campaign chair Jen O'Malley Dillon sent an email to staffers with the subject line: "What We're Seeing So Far."

"As we have known all along, this is a razor thin race," she stressed.

O'Malley Dillon talked about the "blue wall states," and how they will likely not have the results until much later into the night.

"What we do know is this race is not going to come into focus until the early morning hours," she said.

"We'll continue to keep you all updated as we get more information. This is what we've been built for, so let's finish up what we have in front of us tonight, get some sleep and get ready to close out strong tomorrow," she added.

It is increasingly looking like Harris' best -- and perhaps only -- path to 270 electoral votes is by winning the three "Blue Wall" states: Wisconsin, Michigan and Pennsylvania. These states are so named because they voted for Democrats in every presidential election from 1992 to 2012, helping give Democrats a bulwark in the Electoral College. But Trump flipped them in 2016, and ever since, they have been near-essential for Democrats in order to win.

Going into Election Day, surveys indicated that, among the seven main swing states, Harris was polling the best in these three states. She would have liked to have won some of the Sun Belt states, sure, but the northern battlegrounds were more fertile ground. As things stand right now in those states, more votes have been counted for Trump than for Harris, but late-counted ballots are expected to be more Democratic, so they are probably still her best bet to win.