John Dickerson

Saturday night's Republican debate in South Carolina gave us some of the most heated, fantastically ugly and frankly, entertaining, moments of the topsy-turvy GOP presidential primary to date. Yet it wasn't a candidate who came out the winner after the six candidates on stage lobbed barbs each others' way. Rather, it was debate moderator John Dickerson, the host of CBS' Face the Nation, who crisply and humorously kept the debate moving — and the candidates in their places — despite anger-fueled exchanges onstage and a feisty audience.

CBS News Political Director John Dickerson told the hosts of CBS This Morning on Monday that President Barack Obama’s administration could be heading toward a “credibility death spiral” if the problems associated with the Affordable Care Act persist.