North Carolina Lt.t Gov. Mark Robinson, the Republican nominee for governor in that state, denied the accusations put forth in a CNN story published Thursday that he left numerous graphic comments on a porn site’s message board.

North Carolina Lt. Gov. Mark Robinson, the state’s Republican candidate for governor, said he would stay in the race and denied new accusations that he posted racist, antigay and inflammatory comments on a pornography-website message board more than a decade ago.

Mr. Robinson, the Republican nominee for governor of North Carolina, vowed to stay in the race and sought to deny the report, which also said he had defended slavery in online posts years ago.