They did vote for him
Certainly not in numbers that got him nominated. And of course the DNC boogyman that is fronted here had nothing to do with that turn out whatsoever. The superdelegates didn't even matter his numbers were so low and she beat him by a factor of two in Texas. So much for the canard of progressiveness in red states.
https://www.nytimes.com/interactive/2016/us/elections/primary-calendar-and-results.html