As Sanders closes in on Clinton in Iowa, tougher attacks

Aired: 1/11/2016 | 0:08:47 | Clip
Presidential candidates are sharpening their attacks in the weeks before the Iowa contests. Judy Woodruff talks to Amy Walter of The Cook Political Report and Tamara Keith of NPR about ramped up rhetoric on the campaign trail as Sen. Bernie Sanders closes the gap with Hillary Clinton in Iowa.