Four top aides to North Carolina's Republican candidate for governor resigned on Sunday, three days after CNN reported that he once called himself a "black NAZI!" and proposed bringing back slavery in comments posted on a pornography website.

Most of the senior staff members on Lt. Gov. Mark Robinson’s campaign for North Carolina governor resigned on Sunday after reports that he had made a series of disturbing online comments.

North Carolina Attorney General Josh Stein (D), the state’s Democratic candidate for governor, said in a Sunday interview that candidates should be held accountable for continuing to support his opponent,