well olberman is a pundit giving his opinion so i wouldnt say that he is completely objective all the time, and certainly at times his opinions (in todays political spectrum) are "very liberal"....
on the other hand, from what i have seen of her, rachel maddow is outstanding. smartest pundit ive ever listened to, very clear thinkgin, open minded, has common sense, understands the ideas of political principles.
anyway...when i watch political stuff, which is usually everynight before i go to bed(helps get me tired), i watch cspan. i rarely watch cnn, msnbc, fox..ect.