I like Horowitz, but I also know what he is. He has alot of liberal friends and backers, he's a nice guy, who is as neo-conservative as they come, but he tends to be naive at times, and in his honorable attempt to be objective, which he does go through painfull lenghts, he makes hard mistakes and winds up attacking his own. I don't think he attacks conservatives because he wants credibility for when he attacks liberals, but I think that he believes that he is a true conservative, and that everyone else is hurting his cause with bad P.R.
To put it nicely, he's a little out of touch, his heart is in the right place, but all the liberals around him, are starting to probably make him think they are mainstream.