Hillary won the primary popular vote and the delegate count even without the help of superdelegates.
Her margin of popular votes over Bernie was even greater than her margin over trump.
https://en.wikipedia.org/wiki/Democratic_Party_presidential_primaries,_2016
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If the numbers had tilted clearly in the other direction she would have stepped aside for bernie.
She showed herself capable of supporting a stronger candidate in 2012.
She would have done the same in 2016 if there was a clear indication that Bernie was the favored candidate.
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trump would have hate tweeted.