While I don't agree with all of Horowitz' philosophy (he is, after all, an agnostic) I wouldn't call hm a "Rino." As a former "red diaper baby" he really has done yeoman service for conservatism, despite his own ideological hang-ups.
One issue on which I disagree profoundly with Horowitz (aside from his agnosticism) is his retaining of the Left's negative attitude toward Senator Joseph McCarthy. I don't know if it's because of his Communist background or if he (incorrectly) associates Senator McCarthy with anti-Semitism; but he's always been wrong on McCarthy.
My bad!