There's a common perception that there is a left-wing bias in our news media. I don't have much to offer to the situation beyond noting that, based on the analysis I've seen, I agree with the view. Why could this be? I'm sure the truth lies somewhere in the types of people who become journalists, and therefore make decisions about what ends up in the coverage.
But I think a simpler reason could be at play, which is that it's hard to report news about nothing. And although this is an unnecessary generalization, couldn't it be the case that the right-wing is the politics of the status quo, and therefore less likely to generate newsworthy events? Most people don't tune into the news expecting to hear "nothing happened, same as yesterday" even if at some level that's what they support, in the sense of their political views.