Media isn't liberal nor conservative. Media is cash oriented. Fox makes a lot of money aiming their news at a certain demographic the same as all the so called liberal biased media.
If you go with the politically biased media theory, would that make 20/20 biased to the right? They got to comb over that list and just happened to miss the fact that a sitting Republican Senator's office phone number was on there.
And if someone in the media had been the one to figure it all out, you'd be hearing all about it on their channel, something to the effect of "CBS News crack investigative team has learned tonight...yadda yadda yadda."