Realistically, what will Bernie supporters do if he

[LWolf]

236. Realistically, I expect that,

should worse come to worst and Clinton win the nomination, Sanders supporters will carefully consider their options AFTER the convention and each individual will come to their own conclusions about how to vote in November.

What seems to be missing from your OP are a few key points:

1. Clinton supporters tend to fall into a few categories: partisan Democrats who would vote for a dead donkey carcass if it had a "D" next to its name; liberals who like Sanders policies and supported Clinton because they're afraid to buck the establishment; people who are simply so afraid of, or feel so much hate for, Republicans that they would, again, vote for a dead donkey carcass if it had a "D" next to its name; neoliberals who actually like and support the neoliberal takeover of the Democratic Party and Clinton as the neoliberal figurehead; women and others who will cast a symbolic vote for a woman president; and people who actually think Clinton would actually do something for liberal causes rather than working for her corporate masters.

Most of those people would vote for anyone other than a Republican in November, with the exception, maybe, of some of those neoliberals who are more Republican than not outside of their voter registration. The attacks on Sanders from the Clinton camp have been mostly ludicrous; there's no credibility for almost any of them, and a great deal of time has been spent attacking his supporters rather than Sanders himself. We get that; there's very little to say when it comes to issues and record, since Sanders beats her handily in both. That focus on Sanders' supporters is going to backfire in November, though, since the attacks have been vicious enough, and false enough, to engender some strong backlash. The attacks on Sanders himself, though, won't stick, because, as previously pointed out, they are beyond ludicrous.

Are Clinton supporters, when she loses, going to admit "that their negative statements, images, and attacks were unwarranted"?

2. Sanders supporters are not monolithic, either. Some of them will vote for the D nominee in November for most of the same reasons listed above. Those that Sanders has brought in from outside the party won't. This is why we've been saying, repeatedly, that Sanders has a better chance in November. He'll get most or all of the D vote, PLUS crossover votes that HRC will not. Some of the left wing of the Democratic Party, sick of being taken for granted and thrown under the bus, will not vote for Clinton. They don't have to worry about being ethically unable to support Clinton; they won't be supporting Clinton, and wouldn't have anyway. She never had their support, and can't earn it.

Many of those attacks on Clinton ARE warranted. Why would anyone, if Sanders loses, pretend that they are not? That would be unethical.

This primary has been, is, about more than Sanders and Clinton. It's about the identity of the party, and whether or not the party will be wrested back from the neoliberals, or whether the neoliberals will complete their takeover. A line has been drawn in the sand. The neoliberal establishment can no longer rely on party loyalty to bring the left to heel in November, because they've worked to hard to disenfranchise and purge the left. Either the neoliberals are defeated, or much of the left is going to look elsewhere. And, if that doesn't work out well for the neoliberal establishment, they'll have only themselves to blame, regardless of how aggressively they play the blame game to deny and deflect.