Transcript for What's at stake and the battleground states to watch

vote for a lot of people. Election headquarters uptown right now. Guys, good morning. Let's start in the house, the current breakdown, all across the country you see a lot of red and that's because Republicans are the party in power. Now, we've identified more than 100 key races. These are competitive races. We believe this is where the house is going to be won or lost. And you can see there's all types of clusters in York, Pennsylvania, Virginia, Florida, these are key districts we're watching here but even in some red states like Kentucky, Kansas and Texas, there are more than a dozen races we're watching in the blue state of California. We've taken all these competitive districts and we've put them on our chip board. This is our chip board right here. It's organized by poll closings starting at 7:00 with states like Georgia going all the way through 11:00 and beyond. Now, president trump is not on the ballot but this election very much is a referendum on president trump and as the data comes in, we will be able to break it down with a 3D model. All 435 house seats up for grabs and Democrats need to pick up 23 to take control for the first time in eight years. In the senate, the Democrats run are on defense and need to gain two seats but could lose even more. 800,000 new voters signed up on national registration day back in September and some will be motivated by how they feel about this presidency. We'll find out soon enough who will be in control.

This transcript has been automatically generated and may not be 100% accurate.