After Nevada win, how strong is Sanders' 2020 momentum?

With a decisive victory in the Nevada caucuses, Sen. Bernie Sanders of Vermont is the front-runner among 2020 Democrats. Sanders says he is supported by a “multi-generational, multi-racial coalition” that would propel him ahead of President Trump in a national election. But his fellow candidates are criticizing his policy proposals, Senate record and campaign practices. Lisa Desjardins reports.