Four top operatives on North Carolina Lt. Gov. Mark Robinson’s campaign have stepped down, the campaign announced on Sunday.

"I appreciate the efforts of these team members who have made the difficult choice to step away from the campaign," says Robinson.

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.