Republican presidential candidates faced off at their third debate Wednesday night in Boulder, Colorado. This is the first debate since retired neurosurgeon Ben Carson pulled ahead of business mogul Donald Trump in the polls. The pair’s front-runner status prompted Ohio Governor John Kasich to warn that Republicans are on the verge of picking a nominee who “cannot do this job.” We’ll have more on the debate after headlines with Nation writer John Nichols, New Republic editor Jamil Smith, RH Reality Check writer Imani Gandy, and Pulitzer Prize-winning investigative reporter David Cay Johnston.