For Obama, Romney, New Attack Ads Turn Hostile

Aired: 7/16/2012 | 0:10:24 | Clip
In interviews and attack ads, the presidential candidates have taken increasingly hostile swipes at each other as their nominating conventions approach and Mitt Romney prepares to select a running mate. Gwen Ifill discusses what's at stake for both campaigns with Politico's Jonathan Martin and the Atlantic's Molly Ball.