Voters in Maryland, West Virginia and Nebraska are casting ballots in their state's primary contests on Tuesday. CBS News' Anthony Salvanto and Scott MacFarlane break down what to watch in the races that could determine the balance of power in the Senate.

CBS News 24/7 is the premier anchored streaming news service from CBS News and Stations that is available free to everyone with access to the internet and is the destination for breaking news, live events, original reporting and storytelling, and programs from CBS News and Stations' top anchors and correspondents working locally, nationally and around the globe. It is available on more than 30 platforms across mobile, desktop and connected TVs for free, as well as CBSNews.com and Paramount+ and live in 91 countries.

Subscribe to the CBS News YouTube channel: https://youtube.com/cbsnews
Watch CBS News 24/7: https://cbsnews.com/live/
Download the CBS News app: https://cbsnews.com/mobile/
Follow CBS News on Instagram: https://instagram.com/cbsnews/
Like CBS News on Facebook: https://facebook.com/cbsnews
Follow CBS News on X: https://twitter.com/cbsnews
Subscribe to our newsletters: https://cbsnews.com/newsletters/
Try Paramount+ free: https://paramountplus.com/?ftag=PPM-05-10aeh8h

For video licensing inquiries, contact: licensing@veritone.com