But WikiLeaks did lose a lot of support among Democrats
They never had any tangible support among mainstream Democrats, even of the progressive faction, so they had nothing to lose there; the only thing they had to lose—and contrary to your claims they did lose some (but not all, the left fringe isn't a unitary hive mind) was on the left fringe. I suppose you are probably mistaking concern for the content of the early leaks with support for Wikileaks, but those aren't even approximately the same thing.
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They never had any tangible support among mainstream Democrats, even of the progressive faction, so they had nothing to lose there; the only thing they had to lose—and contrary to your claims they did lose some (but not all, the left fringe isn't a unitary hive mind) was on the left fringe. I suppose you are probably mistaking concern for the content of the early leaks with support for Wikileaks, but those aren't even approximately the same thing.
Bernie supporters aren't fringe. Treating them as one was one of the reasons Hillary lost.