Sanders hasn't trashed Obama
I don't think there's enough evidence linking Bernie's rhetoric to his performance yesterday. End of the day if voters want to return to the "good old days before Trump" then there's nothing he can do to win them over without compromising his platform (not outreach) to the point where he's unrecognizable.
I mean, can you clearly outline Biden's platform? He doesn't have one, except restoring the soul of this country. If that's preferable for some voters then at the end of the day you can only hold your hands up.
The silly part about all this is that we're wrangling over turnout in states that will very most likely be delivered to Trump. If Biden wins Texas against Trump I'll concede.
We'll still blame Sanders end of the day if this occurs.