Sanders needs to consider this: if he damages the Democratic party by continuing his campaign, I wouldn't be shocked to see someone challenge him in 2018.
And win like 5% of the vote.
Hmm, I wouldn't be so sure. If Sanders does damage to Clinton and somehow hands Trump the presidency, I think a lot of Democrats would be on board behind the scenes to take out Bernie in Vermont.
So what? The man is more beloved than any other politician in the state and it's not even close. There is zero chance of him ever losing an election in Vermont. You did see him deny Clinton viability there, right?