If Biden is the nominee

Yes, I'd vote for him, but only because Dump must go. I'd still fight like hell to implement Bernie's (our) progressive agenda, and to install progressives in Congress and the Senate who support it. But we're not there yet. In the meantime I'll fight like hell to nominate Bernie because he is the best and safest bet to defeat Dump. 

Unfortunately, I've seen at least some progressives openly state they will not vote for Biden. And I'm guessing many of the young voters that support Bernie will figure to hell with it if Biden is the nominee. So chances are good Biden will lose to Dump. If we really want to beat Dump then we really need to nominate Bernie.