'I have to earn this on my own': Biden on receiving Obama's endorsement

Just after the South Carolina primary, 2020 presidential candidate and former Vice President Joe Biden is interviewed on "This Week."

This,Week,George,Stepahnopoulos,Joe,Biden,presidential,candidate,2020,election,South,Carolina,Bernie,Sanders,Donald,Trump,Michael,Bloomberg,Super,Tuesday,p_cmsid=2494279,p_vid=news-69318363,