During Obama's speech, I flipped to Fox News to see if they were playing it. It looked like they were. I think, to a certain extent, casual Fox viewers, when able to see Obama unfiltered and unedited, question the impression that Fox creates of him. It's a caricature, and when faced when the reality, they may be open to him.
I also caught the tail end of the interview Anderson cooper had with Christine Taylor's parents, where her father called her a "patriot and great American" (and I thought, oh boy, there's a Hannity fan). When Anderson asked him if he thought "vitriol" had anything to do with the shooting, he said "I'm not willing to go there". But he said his wife was thrilled when Obama called them to offer condolences and that Obama "seemed like a decent man". He clearly was having difficulty reconciling his view of Obama based on the Fox news caricature and the reality he was seeing. Feel free to add anything in the comments I might have missed (or if my interpreation is way off).
We need to find a way to impose reality over the caricature. I think asking the questions that someone posted earlier in the diary about fairness and support of society is a great way to do that. And then have facts available about who did what to help "balance" society. People will probably look that up on their own. Like they say, you catch more flies with honey than vinegar.
I honestly think this tragedy will create a course correction in our country. Not because Beck and Hannity and Limbaugh will shut up. But because the more casual viewer will superimpose the image of Obama over the hate and vitriol and say "enough".