They’ve parried and thrusted on each other’s shows so many times by now, so to speak, that both Jon Stewart and tonight’s guest, Bill O’Reilly, seem to truly enjoy the game, whenever one of them ventures into the other’s lion’s den. Tonight, O’Reilly makes his latest appearance, to promote his latest book – while Stewart, as usual, will want to talk at least as much about what he perceives as the latest excesses by Fox News. Gentlemen, en garde!