The good news for Sanders is that the states where he benefited the most from the #NeverHillary vote — especially in Appalachia and in the Interior West — have relatively low delegate tallies. So they’re places that he can potentially afford to lose. It does mean, however, that Sanders will have to hit his mark in his other strong regions, including New England (where Warren will provide fierce competition), the Upper Midwest (where Sen. Amy Klobuchar of Minnesota could create problems in her home state and Wisconsin) and the Pacific Northwest (where Sanders would prefer that candidates like Washington Gov. Jay Inslee and former Colorado Gov. John Hickenlooper not enter the race).
It also means that Sanders won’t just be competing against other progressives but also against relatively moderate candidates. If #NeverHillary voters from 2016 are again looking for an anti-establishment candidate, Sanders could still fit the bill. If they want a moderate instead, however, they’ll have a lot more choices than they did in 2016 in the form of candidates like Klobuchar and (if they enter the race) Joe Biden and Beto O’Rourke. It’s also possible that #NeverHillary voters were mostly motivated by sexism, in which case any of the male candidates could stand to benefit.