Correspondent Vicki Barker reports the streets of Paris are deserted, under a state of emergency, after a series of terror attacks blamed on ISIS that left dozens dead and injured, Correspondent Cami McCormick on the U.S. drone strike which apparently killed the ISIS executioner known as Jihadi John, Steven Portnoy and Major Garrett on the fourth Republican Presidential debate and Allen Pizzey on the aftermath of the crash of a Russian plane in Egypt. All that and more on the CBS News Weekend Roundup.