nbc's kristen welker is with the clinton campaign in virginia. krist kristen, what can you tell us. >> reporter: lester, good evening. clinton campaign officials say they feel confident heeding into super tuesday after that big win in south carolina, fueled largely by african-american support. clinton hoping to build on that tomorrow. senator sanders vowing not to give up, but he does have a steep climb, particularly if you look at the numbers, lester. the official nbc news delegate count shows clinton with 519 delegates and sanders with 86. if you only take into account super delegates, typically party leaders who get to choose who they will support, clinton gets 428 to sanders 21, a 20-field advantage. clinton is up with ads in all of the super tuesday states and sanders with ads in five of them, smaller, less diverse states like colorado and massachusetts. still, sanders has a lot of cash on hand which means no matter what happens tomorrow that could allow him to stay in this race indefinitely. lester? >> kristen welker tonight, thank you. >>>