The New York Times, September 9, 2011 by Gerry Shih
http://www.nytimes.com/2011/09/09/us/09bccampaign.html
Mr. Ekmen and his wife, Mary Ann Mason, a professor at the University of California, Berkeley, attributed the dynamic among the candidates to ranked-choice voting. “They were kind to each other,” Ms. Mason said after the debate. “It’s very hard to figure out the differences if you didn’t know them before.”