grackle, and that seems to be right, though it is more iridescent on the wing and less blue around the collar than the common grackle. Is it just a particularly flashy individual or is it a particular variety? It looks like a great-tailed grackle, but this map says that the great-tailed grackle doesn't live in New England. Any suggestions?
If I were a grackle, I would definitely maximize my spookiness by living in an old graveyard. This is a grackle with style.
Also, if it helps with identification, here is a pic of the bird it was hanging out with, which I assumed was a female grackle: