Bill Clinton returns to the trail to campaign for Hillary

Aired: 1/4/2016 | 0:10:10 | Clip
Former President Bill Clinton made his first solo appearances on the campaign trail in New Hampshire to support his wife Hillary's 2016 campaign. Amy Walter of The Cook Political Report and Tamara Keith of NPR join Judy Woodruff to discuss the strategy behind Donald Trump’s first television ad, plus Gov. Chris Christie’s pitch to New Hampshire voters.