Well, ladies and gentlemen, sometimes in the birding world we just have to let one go. I want my mystery bird to be a Cape May more than anything, but I can't rule out Black-throated Green, Magnolia, Blackburnian, or others. I've asked my readers, several forums, and a few others and I have not received a consistent answer. The bird was covorting with a Black-throated Green and the chip notes it was making don't sound anything like the Cape May on my CD. BUT, the bird did have a gray back as I recall. I would expect a BT Green to have an olive-green back. We can go on and on and look at Blackburnian, Magnolia, and the others that were suggested. I won't do that though since the photos are poor, the bird's plumage is poor, and everything is just speculation. So, in conclusion, I'm calling it "unidentified ratty warbler".