I have to say that IMHO we are approaching a point in time when the bottom will simply fall out for Sanders. His campaign is reaching critical mass of missteps and perceptions of incompetence where many of the supporters he can count on now will just walk away shaking their heads… Not just that. But much of the enthusiasm he built early on was based on the fact that he ran a positive campaign (“People are just sick of hearing about the damned emails”). He has now gone negative in a precipitous, thoughtless way and is doing perhaps the greatest damage to his brand that was ever possible to do. The two things together are lethal.
Also, from the way he treated his wife in public, from how he has attacked Clinton, from the still-continuing lawsuit against the DNC, and the campaign to harass the superdelegates (which may not be officially approved but is not officially condemned either by his campaign), I cannot help but conclude that Bernard Sanders is the original BernieBro. If you know what I mean.
Reuters poll may indicate the bottom is falling out, already.