Link?
https://www.newyorker.com/news/john-cassidy/why-bernie-sanders-is-staying-in-the-race
https://www.politico.com/story/2016/06/bernie-sanders-campaign-last-days-224041
"But more than any of them, Sanders is himself filled with resentment, on edge, feeling like he gets no respect -- all while holding on in his head to the enticing but remote chance that Clinton may be indicted before the convention."
"Top Sanders aides admit that it’s been weeks, if not months, since they themselves realized he wasn’t going to win, and they’ve been operating with a Trump’s-got-no-real-shot safety net. They debate whether Sanders’ role in the fall should be a full vote-for-Clinton campaign, or whether he should just campaign hard against Trump without signing up to do much for her directly.
They haven’t been able to get Sanders focused on any of that, or on the real questions about what kind of long term organization to build out of his email list. They know they’ll have their own rally in Philadelphia – outside the the convention hall—but that’s about as far as they’ve gotten.
“He wants to be in the race until the end, until the roll call vote,” Weaver said"