The only problem is that Sanders is not a "democratic socialist", he is a Socialist. And by that I mean that he visited Cuba and the USSR when they were Communists and publicly praised their leaders and their system of government. He visited the Sandinistas and did the same. You don't think that would be dragged out there again?

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They could rehash his attacks on compulsory schooling, dairy laws, and fluoridation, or his Freudian analysis of napalm use in Vietnam, or his advocacy of public toddler nudity and genital touching as cures for porn, or the sexual quackery through which he attributed breast cancer and cervical cancer to orgasm deficiency and capitalist conformity.
Basically, if you were designing the perfect target for Republicans—a candidate who proudly links socialist economics to hippie culture, libertinism, left-wing foreign policy, new-age nonsense, and contempt for bourgeois values—you’d create Bernie Sanders.

from Polls say Bernie is more electable...

Personally, I have no problem with America turning into a Swedish-style socialist paradise. But once Republicans finished attacking Sanders all the Independents and many of the Democrats would not vote for him. That's why I say Republicans would LOVE to run against Bernie. This is just political reality even if you don't think it is fair.