<http://schema.org/url>
<http://www.businessweek.com/articles/2013-06-06/obama-campaign-says-it-was-42-percent-more-accurate-than-nate-silver>
<http://www.bloomberg.com/bw/articles/2013-06-06/obama-campaign-says-it-was-42-percent-more-accurate-than-nate-silver>