tl;dr they are archiving political ads off TV and try recognising them in software by their sound using <a href="http:&#x2F;&#x2F;labrosa.ee.columbia.edu&#x2F;matlab&#x2F;audfprint&#x2F;" rel="nofollow">http:&#x2F;&#x2F;labrosa.ee.columbia.edu&#x2F;matlab&#x2F;audfprint&#x2F;</a> I think.<p>They don&#x27;t say how political ads sound different from other TV - I guess it works? Or maybe they are just using it to check if they have that ad already like how Shazam works?