Hoping to revitalize the momentum that propelled him to the White House, President Biden told a largely Black audience on Saturday night that “you’re the reason Donald Trump is a defeated former president,” in what was effectively his first appearance related to the Democratic primaries.
Mr. Biden made clear in his remarks at a South Carolina Democratic Party dinner in Columbia, S.C., that he viewed the forthcoming week as not just a contest but a pivotal moment to energize a frustrated base of Black voters across the nation. And in the run-up to the state’s Feb. 3 Democratic presidential primary, which the party’s national committee selected last year to be



