Bernie chose a bad campaign strategy by not focusing on the southern large delegate vote in the beginning.
This is why he lost so early on.
Bernie's campaign began with the problem of conservative Southern states dominating the early primaries, artificially creating momentum for the establishment candidate. In other words, the primary schedule was set up to favor the status-quo...and unfortunately (for the people), that strategy (combined with having the corporate media in the bag for Hillary) may well have succeeded.
Bernie did what he could in the South (and is quite obviously the better candidate for that region's vast majority of working class people), but it was too much to overcome.
Hillary had name recognition and a powerful set of friends going into this.
Neither of these things give us jobs or healthcare or a healthy environment.
Quite the opposite is true.
And, shes the weaker candidate against Trump.
Sanders for the win.