Lt. Gov. Mark Robinson of North Carolina, the Republican nominee for governor of the battleground state with a long history of inflammatory and offensive remarks, on Thursday vowed to stay in the race as CNN reported that he had once called himself a “black NAZI!” and defended slavery on a pornographic forum.

In an 82-second video released before the CNN article had published, Mr. Robinson sought to undercut the report, which unearthed old comments that he had reportedly made on “Nude Africa,” a pornographic site with a message board.

Mr. Robinson, a social conservative who has been a strident opponent of transgender rights, also posted about how he enjoyed watching transgender pornography, according to CNN, describing himself as a “perv” who liked “tranny on girl porn.”

In his Thursday video, Mr. Robinson said: “Let me reassure you. The things that you will see in that story — those are not the words of Mark Robinson.”

CNN said it had chosen to publish only some of Mr. Robinson’s messages, many of which were sexually explicit and graphic in nature. He made the comments between 2008 and 2012, according to the report.

To verify that Mr. Robinson was the poster behind the comments, CNN identified the username “minisoldr” as one Mr. Robinson used frequently online. In addition to matching biographical details, the report said, Mr. Robinson had listed his full name on the Nude Africa site along with an email address that he had used on various websites “for decades.”

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