DrewsMum, it’s a wasted vote because you can write Chris in, but it won’t count. He can’t win, even if he had a majority write him in, because he’s not a legal write-in candidate. See this column for a brief explanation:
http://www.sunherald.com/2014/06/25/5668867_write-in-after-runoff-the-answer.html?sp=/99/184/208/&rh=1
Thank you for the info!