Polls are open in the South Carolina Democratic primary, which President Joe Biden is expected to win easily. However, today's contest could reveal if he has lost support with an important bloc of voters. CBS News' Nicole Killion has more from Orangeburg, South Carolina. "CBS Saturday Morning" co-hosts Jeff Glor, Michelle Miller and Dana Jacobson deliver two hours of original reporting and breaking news, as well as profiles of leading figures in culture and the arts. Watch "CBS Saturday Morning" at 7 a.m. ET on CBS and 8 a.m. ET on the CBS News app. Subscribe to "CBS Mornings" on YouTube: https://youtube.com/CBSMornings Watch CBS News: https://cbsnews.com/live/ Download the CBS News app: https://cbsnews.com/mobile/ Follow "CBS Mornings" on Instagram: https://instagram.com/cbsmornings/ Like "CBS Mornings" on Facebook: https://facebook.com/CBSMornings Follow "CBS Mornings" on Twitter: https://twitter.com/CBSMornings Subscribe to our newsletter: https://cbsnews.com/newsletters/ Try Paramount+ free: https://paramountplus.com/?ftag=PPM-05-10aeh8h For video licensing inquiries, contact: [email protected]