The McCain campaign is being called out on some of the lies they have been telling. The campaign spokesman says that they are in this to win and don't care what the "media filter" says.
I think we will get a test of their theory that the "media filter" doesn't matter anymore. This is to a large degree about who controls the information channels now. The conservative movement has been building to this with their well-funded "liberal media" campaign. They have they're mouthpieces like Rush constantly telling his audience not to ever believe the media. The right has a very large following. The result is that most of the public believes that the major news media is a propaganda machine for liberals and should not be trusted.
And they have the advantage that repetition of messages does work. They are running ads that say Obama will raise your taxes, force sex talk on your kindergartners and all that stuff -- even one that says Obama is the anti-Christ. They have the money to run those ads over and over on shows that lots of people watch. And they have the wealthy and corporate-backed front groups running ads and robo-calls and smear campaigns, etc. against Obama. People don't necessarily watch or believe mainstream news, but they will see these ads again and again.
So do the authoritarian conservatives have the power to override facts and "create their own reality" as they did in the lead-up to the Iraq war? I really don't know the answer and wouldn't bet my house on it either way.
Remember, tobacco company marketing is able to get people to kill themselves, but to hand over much of their money in the process. Modern marketing methods can convince almost anyone to do or believe almost anything.