Tonight's debate to unveil FOURTH front-runner

Melissa Holzberg details how past Democratic debates have affected the horserace and what may come from Wednesday night. With Pete Buttigieg on the rise in Iowa, he'll likely be in the hot seat — maybe even more so than Joe Biden, Elizabeth Warren, and Bernie Sanders. The full episode on video is available on MeetThePress.com. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.