This is the most brutal ad yet from the 2012 presidential election. In my view, it goes too far. 

It features the story of Joe Soptic, who claims he lost his job after Bain Capital, the VC firm for which Mitt Romney worked as CEO. 

Soptic lost his health insurance along with his job, and he couldn't pay for his wife's cancer treatment, who died. Implied message of the ad: Mitt Romney indirectly killed Soptic's wife.

The viral video, called "Understands", is been produced by Priorities USA Action, an Obama-affiliated Super PAC.  

See below is another viral hit by this political group.