I've seen this warbler lately at my feeder on Oak Pt. Rd in Trenton and finally figured it out:
Northern parula
It hovers in front of my window so I can get a good look at it.
Also have had no more than 3 white-throated sparrows here but this week there have been at least 12 every day. They arrive early in the morning before I put the feeders out and pick up dropped sunflower seeds from the day before. They have been the last birds to leave in the evening as well.