Mark Robinson, the hardcore conspiracy-theorist Republican running for governor in North Carolina, has been posting through it ever since his rise to power in 2021 as the state’s first-ever Black lieutenant governor. He’s called the Holocaust “hogwash” and described the Nazis as “upstart amateurs in terms of manipulation and murder.” Robinson’s also drawn the attention of online extremist groups, including the white supremacist forum Stormfront, a website founded in the 1990s by a Ku Klux...