Dissecting Santorum's Ominous 'Obamaville' Ad

GOP presidential hopeful Rick Santorum released what may be the hardest-hitting ad of the 2012 campaign. "Welcome to Obamaville," shot and scored like a trailer for a Hollywood horror film, features a split-second flash of President Obama's face superimposed over the image of Iranian President Mahmoud Ahmadinejad. Guest host Laura Sullivan speaks to NPR's David Folkenflik about the ad.