Marc Ambinder points to campaign stops by the senator’s wife as evidence she’s helping sway South Carolina’s black voters.

A turning point may be have been a big M.O, speech in on November 20, Orangeburg, where she told hundreds of black voters that she’s “so tired of being afraid” and didn’t want her daughters to grow up being afraid. She speaks of her proud, South Carolinian grandfather, who taught her that “my destiny had not been written before I was born.” Her family “gave her the strength and courage to overcome the doubts” that she faced as a young girl growing up on the south side of Chicago.

The campaign made DVDs out of Michelle Obama’s “Fear” speech and plays them regularly — at house parties, at events, at organizing conclaves, at beauty parlors and barber shops — what the campaign calls its B and Bs.