I'd bet a lot that everyone in the Dem establishment is leaning on Obama to jump in against Nina. Fortunately, Nina's lead is so big that Obama may not risk "Hillarying" himself like Clinton did in (IIRC) Florida. Nina had six figure donation days after Hillary and Clyburn came out against her. Obama may be corrupt AF, but he is politically savvy enough to know it is super risky to bet against Nina.