Polls show Biden, Sanders and Warren at top of 2020 Democratic field One new poll shows former Vice President Joe Biden with a 13-point lead over his next closest competitors, Senators Elizabeth Warren and Bernie Sanders, but another poll shows the three nearly tied. Elizabeth Landers, a Washington correspondent for "Vice News Tonight," and CBS News campaign reporters Zak Hudak and Cara Korte spoke to CBSN's Elaine Quijano about the current state of the race.