Proposing that Sanders should continue his campaign, not with the aim of winning the nomination (since that is unlikely) but rather with the aim of influencing policies after the election.

I think the best chance of influencing policies after the election is the chance that Sanders may win. Biden gives us no chance of ending plutocracy, because he never wanted to do that.

As for the idea that people should "unite" behind Biden, if he wanted my support he should have stood for progressive policies.