Joe Biden and Bernie Sanders brace for one-on-one battle in next round of primaries

Democratic front-runners Joe Biden and Bernie Sanders are bracing for a one-on-one battle ahead of the next round of presidential primaries. Six states will vote on Tuesday, March 10. CBS News political correspondent Ed O’Keefe joined CBSN with more on what the candidates are doing, and CBS News campaign reporter Cara Korte looks at what Sanders needs to do to regain momentum. Source