Why did Bernie lose twice?

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Zikten posted...
But I think it's also true that Biden had meetings or phone calls with each remaining runner, got them to drop out and support him instead of Bernie. I am pretty sure I remember some of the runners actually admitting these meetings took place

Yea. Bernie was allowed to talk to other candidates in order to build a coalition and/or potential cabinet as well. Thats allowed.
"The soul in the darkness sins, but the real sinner is he who caused the darkness." - Victor Hugo