Mike Wallace was one tough s.o.b. -- or so he wanted you to think of him on air. Off camera he could be as charming as Rhett Butler.We were colleagues during my seven years at CBS News and our offices were on the same floor. He was always polite, attentive, encouraging. Competitive, yes, but not ruthless. Nobody could beat him at quick banter; once, when I produced a series for PBS on the
stories of Genesis, he said, "Moyers, you're the only ...