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.

Several top staffers in North Carolina Republican Lt. Gov. Mark Robinson's campaign for governor have quit their posts, marking more fallout from a CNN report outlining evidence that he made disturbing posts on a pornography website’s message board more than a decade ago.

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,