None of Berie followers have a thought molecule to tweet between them. But Trump (and I’m not a fan) is a symbol of capitalism. That alone will keep them away in droves.
Trump as a symbol of capitalism will tamp it down, but Trump in reality is a crony capitalist in many ways and a proponent of a big strong government doing big strong things. The appeal is not universal, but it is there to a degree.
No one is saying a mass migration here - just that there is some cross over. And do not lump all Bernie supporters into the same camp necessarily.
You’re forgetting the “nationalist” element in Bernie’s “coalition.”