Seems like feisty 86-year-old Robert Morgenthau, the inevitably reelected Manhattan D.A., still hasn’t forgiven primary challenger Leslie Crocker Snyder for, among other things, bewitching the Times editorial board into endorsing her. Invitations just went out for his November 15 fund-raiser at Webster Hall “to celebrate the victory and retire the campaign debt.” Even though that’s two full weeks after Halloween, the invitations are decorated with a little witch. Is that a backhanded poke at his former opponent? Yes, Morgy campaign staffers say. Oh, yes. “How does that song go again?” jokes one. “Ding-dong, the wicked witch is dead.” Snyder’s spokesman says Snyder wishes Morgenthau and his supporters a “belated Happy Halloween,” but otherwise won’t rise to the bait. He also won’t say if Snyder’s planning on running again, but she should take heed: A Morgenthau staffer says that, after checking the books, it turns out there wasn’t much debt to retire, so the money will likely go toward the D.A.’s ’09 campaign.