2. They switch the scedules of conservatives all the time. They especially did this during the 2000 presidiential campaign, when we would all be waiting to see President Bush in a campaiign appearance, and then inexplicably we would get Gore or Lieberman. It happened multiple times.
3. They routinely feature anti-American demonstrations, but will not carry demonstrations in support of the President.
4. Their callers are weighted, as you said, in favor of the liberals. Plus, liberl, Bush-bashing callers get lots of time to talk, while Bush supporters are cut off.
I only watch C-SPAN when they are showing live coverage of a committee hearing or something. Otherwise, it makes my blood pressure go up.