At the end of the ABCNews.com obit for David Brinkley it says:
Sandwiched between conservative George Will and outspoken Sam Donaldson, Brinkley was the objective moderator. But he revealed a bit of himself at the end of each show in a short commentary. “
So conservative over here, “outspoken” over there, objective in the middle. What else could “outspoken” mean? Of course, I kind of like the implication. No ideas, no ideology: just a lot of loud talking.