<http://schema.org/topics>
"2012 presidential campaign,Advertising,features,gallery,political videos,Politics,Television,Uncategorized,U.S.,World,Video,Videos,YouTube"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/09/13/influential-campaign-ads/?WT.mc_id=en_youtube>