What do Biden's wins mean for the Sanders campaign's future?

As of Tuesday night’s primary elections, former Vice President Joe Biden leads Vermont Senator Bernie Sanders by 150 delegates, making it a difficult road ahead for the latter campaign. Sanders supporter Rep. Alexandria Ocasio-Cortez called it a “tough night” on Instagram. CBS News political contributors Robby Mook and Terry Sullivan weigh in on the path forward for both campaigns on “CBS This Morning.”