Earlier in his career, Sam Feist ran a news program called “Crossfire” that tried to capture viewership by having liberals and conservatives bicker with one another. Now he hopes to achieve similar results with a similar program that drops the arguments and squabbles. The new offering is called “ Ceasefire ” and will debut Friday on C-SPAN , the public-affairs cable network that has for nearly half a century provided viewers a fly-on-the-wall presence at major Congressional hearings and other