I actually agree there's a sour-grapes element among a faction of Sanders supporters, but I don't believe it's coming from Bernie. I think he'll campaign all the way to the Dem Convention and if, as it appears increasingly probable, Hillary is the Democratic candidate, Bernie will support the Dem ticket and encourage his supporters to do so as well, then in 2020 (or 2024), either Bernie or Elizabeth Warren will carry the Progressive banner.
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