I think the biggest problem is more with a lack of time then a lack of caring. While apathy is a huge problem, who has time to sit at work and watch YouTube (or CSPAN) video all day? Hell, most of the Congress speeches are already written, rehearsed and recorded before they even step on the floor. They even have the press releases out the day before. How many times have you seen "Senior Senate from a state to deliver speech on [topic de jeur] tomorrow."
So little is actually a surprise inside the chambers that there is no actual reason to watch this crap, on TV or online.