McDuffie wasn't sure whether he was a "moderate." Even the Washington Post noted that he seemed confused about what his candidacy was about.
If the voters (and "activists") didn't know why to vote for McDuffie, it's because McDuffie also didn't know why to vote for McDuffie.
Tucker Jones
now that they know that Janeese won the majority black wards they've all settled on a theory that the voters were dumb.