Speaking economically. I have no problem obviously with Bookers or Castros positions on immigration or Crime. Someone with the same policy socially, but moderate economically is indeed moderate in comparison. To argue otherwise dismisses economics, which are just as important to sanders and warren voters.Not really. Bernie's criminal justice and immigration bills are based off bills that one of those "moderates" wrote and he cosponsored.
I think pretty it's obvious that to pull voters away from Bernie and Warren you needed the economic component as well. Hence the youth vote coalescing around the oldest candidate. He is offering something the others don't including all of the candidates closer to their own age.