(function(){ var s = document.createElement('script'); s.type = 'text/javascript'; s.async = true; s.src = 'http://www.cbsnews.com/live/scripts/widget-compact/'; var el = document.getElementsByTagName('script')[0]; el.parentNode.insertBefore(s, el); })(); The three Democratic presidential candidates are gathering Saturday night at in Des Moines, Iowa, for their second debate. The debate will air on CBS and will also be live-streamed here, in collaboration with CBSN. It is scheduled to start at 9 p.m. E.T.

Hillary Clinton comes into the debate with her front-runner status looking more secure than it has all year, following a strong performance in the first debate in October and a series of polls that show her sporting big leads over Bernie Sanders nationally. The third candidate on stage, Martin O’Malley, has yet to make a major impact on the race.

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