Most Dems know that voting for Sanders is a waste.
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Even if he got elected he would get literally no cooperation from Congress.
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Sanders is now one of the most ineffective Senators.
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The Dem nominee has to have Never Trumper crossover votes to beat Trump. Never Trumpers will stay home rather than vote for Sanders.
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That’s what has the Dems in a lather.
Bill Kristol may even change parties again.