GEORGETOWN, South Carolina — The polls say Joe Biden is regaining a solid lead in South Carolina after a slump that followed dismal showings in Iowa and New Hampshire. In three new surveys, all taken in the last five days, Biden leads Bernie Sanders by 15 points, 16 points, and 20 points. (In two others, he leads by 8 points and 4 points.)

Biden’s support does not appear to be particularly deep, but that does not really matter if the vote Saturday aligns with the polls. He will win and survive at least for a few days until Super Tuesday.