In terms of bias in reporting, I don't believe there's a systematic bias.
This might not be bias at all, but maybe across the country there's a bit of quirkiness in the sense that reporters might go to the same experts for opinions because it's easier; they have their number in their BlackBerry and they've established a rapport with them.
Once I remember--and again, this was a private broadcaster--watching a news clip about day care on the six o'clock news and I saw a friend of mine. The clip showed them taking their kids to day care. I asked how they got on the news and it turned out so-and-so's brother worked for the station.
How do you guard against reporters or producers getting too comfortable and always going to the same people, and sometimes giving profiles to the same people?