The reason for this rhetorical disparity is that conservatives and libertarians seem to have a much better grounding in the idea that they have a political ideology. Liberals lack this sense, believing their ideology to be literally incommensurable to other ideologies. To oppose liberalism is thus not only intellectually incorrect, it is also an affront to common decency.In other words, he says that liberals suffer from what has been called epistemic closure.
David Greenfield in his blog Sutan Knish has an entertaining rant on the ideological bias of the mainstream media:
By putting politics over profitability, the media left alienated viewers and readers exactly during the critical transition period when it needed them most. And the worse its fortunes grow, the more radical its politics have become.
When it came to a showdown between the principles of journalism and the principles of liberalism-- journalism never stood a chance. And all that was left was shrill political advocacy, propaganda if you will. Numerous stories praising their politicians and their cultural figures. Numerous other stories damning opposition politicians and elements of culture that displeased them. And the costs to the nation were high. The same media that did everything possible to destroy McCain and Palin, also portrayed Obama as a visionary leader, even though he had barely nailed down 100 days in the Senate before running for President.