Saying #Biden is the "electable candidate" is the same memetic branding as "Windows for business and Mac for graphic design". It's false. The DNC already ran a neoliberal centrist against Trump; she lost because a bunch of disheartened voters didn't turn out.
Look at his record: his hand in school segregation, his leadership in tough on crime lays, supporting trade deals, pro-war, bundling the domestic abuse bill with unrelated policies.
Even if he wins, it's just back to business as usual.