I mean, I agree, but... who is this person? None of the younger Democrats are especially close to Sanders. The Democrats have the same problem as Labour does in the UK - the party became an ideological monoculture and slowly strangled out any alternative kind of thought. All the younger candidates tend to be very clearly Clintonites ideologically, just as most of the younger Labour candidates ended up being Blairites (or Brownites) ideologically. When the mood for change arrived, in Labour, it had to pick up one of the few remaining 'fossils' of an older ideology, since everything new had been squeezed out. You see the same problem with the Democrats - there is no young Bernie.
Almost the entire Democratic field of candidates is pretty poor. All of them represent the liberal intelligentsia, come from excellent universities/law schools, live in relatively urban areas, and represent a totally different class to the type of voter that went Obama -> Trump.