So SC appears to be the DNC's slingshot manoeuver (see Talledegah Nights). It's a clever play. Have the party hierarchy endorse the favored status quo candidate, knowing the SC voters are likely going to fall in line. Then on the back of a strong win, you get a 3-day media boost, from all the massed ranks of print media and cable TV pundits deeply entwined with the party establishment, orchestrate the fellow moderates dropping out, and build momentum going into Super Tuesday. Biden is off the ropes now and looking to go strongly head-to-head with Sanders.
So, Biden either wins a plurality (unlikely), or ends up a nose ahead or slightly behind Sanders (likely). Either way, the superdelegates confirm him. The House Always Wins.
Forward into the Valley Of Death ride the Dems, behind General Biden, our fearless leader, ready to neuter all promising avenues of attack on Trumps major vulnerabilites (corruption, nepotism, corporate/oligarch servant, addled brain) with his own chequered resume, and counter the fanaticism of Trump's base with the meh of his, and especially the indifference of Latino and youth voters. Although he'll lose the rust belt states as Clinton did, and for the same reason (support for job-killing trade bills), he'll finish a respectable second in all the southern red states, and Trump will only win a narrow victory in November. We'll get the coveted Participation Trophy again (winning the popular vote).
But not to worry. A Biden Administration would have done next to nothing about healthcare costs (lobbyists and donors are running his campaign), climate change, worker rights, corporate overreach, foreign meddling, wealth inequality, military budget, student loan debt, educational opportunity. So Trump or Biden, what does it really matter for the vast majority? What matters is optics, the facade, the softening of oligarch rule, the pretense of a pivot.
