The ‘Sleeper’ Senate Battleground Dems Are Overlooking

It isn’t Pennsylvania, where the nation’s most prominent TV doctor is losing daily Twitter battles—and in the polls—to a Democratic Senate candidate permanently clad in a hoodie. And it isn’t Wisconsin, where voters may finally have had enough of a hard-right Republican senator spouting conspiracy theories.

It’s North Carolina, where Democrats have one of their very best chances to flip a GOP-held Senate seat—even if the party’s biggest donors and outside groups haven’t yet acted like it.

Part of that may be the candidates. The Democratic nominee, former state Chief...