To quote Eric Alterman, "What Liberal Media?" The right wing has perfected the strategy of "working the refs" to the point where Republicans are quoted 44% more than Democrats, and most media outlets are measurably more negative toward Obama than to Romney.
From 4thEstate.net:
LIBERAL MEDIA BIAS: Fact or Fiction?
Our data does not support the thesis of a liberal media bias as it relates to Election 2012 coverage. If anything, our analysis suggests a media bias towards both Mitt Romney and Republicans. There are multiple data points included in our analysis. In news stories and broadcast transcripts that we analyzed over the last 3 months, newsmakers appearing in the media as partisan Republicans are quoted at a 44% higher rate than partisan Democrats. Additionally, the ratio of positive to negative coverage was 17.1% more critical of Obama than Romney. We processed 717 articles and 15,357 quotes collected between May 1 and July 15, 2012.