<http://schema.org/topics>
"2012 election,Advertising,Conversations,Politics,pbs,trending,Uncategorized,U.S.,World,Video,Videos"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/10/09/sesame-street-obama-ad/?WT.mc_id=en_2012-election>