Many lessons that involve C-SPAN begin with a teacher, at home, watching C-SPAN on television and thinking, "If only my students could see this…" while scrambling to record the program — a congressional hearing, author's lecture, visit to a historic site, etc.
Finding a good clip is an important first step! You are on your way to teaching with C-SPAN. C-SPAN in the Classroom is here to help with ideas for putting a lesson together.